Still not getting it, and I would like to understand what exactly causes Lee-prejudice.
Bullet seating using the Lee dead length bullet seater is altered by two things. If you follow the instructions for a Lee bullet seating die and back off 1/2 turn for no crimp or advance 1/4 turn for a slight crimp the depth of the die in the press is a non-variable. The shell-holders are consistent, so that is a non-variable. The adjustment screw for the seating plug is the variable. The deeper you screw this, the deeper the bullet will be seated. It does not matter how hard you press the handle, it wont advance the case into the die any further because the the ram is stopped by the overtravel stop (I applied excessive force and to my lever and it did not budge a at all. I clamped my caliber to the press and used my depth gauge to measure this to the .001+/-). If you use a crimp then the ram is stopped by the die/shell holder contact. I almost always use a slight crimp to straighten out the case mouth because I almost always shoot cast bullets. Lee says they make their presses at least 3x stronger than is needed. They don't make them 10x stronger so foolish reloaders can gloat about how strong their press is. Little force is needed to seat a bullet (or resize a properly lubricated case for that matter). In fact the Classic cast is really overbuilt for most purposes; I'm the kind of guy that likes to wear suspenders and a belt, but I am not willing to damage the linkage on my Classic cast just to test the hypothesis that it may advance past the overtravel stop (by smashing it essentially). I have concluded the gorilla like force needed in order to do this is so excessive that anyone doing it should know better.
Unless you are some sort of benchrest shooter, Lee products are more precise than needed in general. If you shoot misups like me, it is way more precise than needed. Precision of the equipment resulting in better performance on paper is an idea propagated by the reloading industry to justify making products excessively precise and expensive (RCBS dies that have micrometer bullet seating depth adjustment come to mind). This is not true of all things. Scales are very important, the internal dimensions or the die body, its finish, the internal dimensions of the mold cavity and its finish, etc. are very important. In these areas (except the safety scale, which has dampening problems because of its light weight) Lee maintains as good or better standards as any other mass market reloading company, at least in my experience. It might not have pretty knurling on the outside or have set screws in the locking rings, but these are features that add cost and do not improve ammo. You may admire the handsome finish or your Redding press, but it is not going to rust and slower or faster than the finish on my Classic Cast. When I compare the performance of my $67 Redding K31 neck sizing die set to my $26 Lee collet neck sizing die for 7.5x55, I note that the Lee makes more accurate ammo, needs no lubrication, and costs less than half! The Redding has nice knurling on the outside and a blued lock ring, though. The design of the Lee collet die is so far ahead of the Redding button-dragging die, it is hardly a comparison!
My friend has done heavy duty swaging (swaging lead wire into bullets, swaging .430s into .452s) on a Classic cast , something the Classic cast is not designed to do. Remarkably it held up for years with this abuse, but eventually the linkage gave way when he was using a hammer to bang the handle downwards (the linkage is made of sintered metal, which makes it the cheapest and weakest part in the press, sort of like a sacrificial plastic gear in an engine lathe)! Lee replaced the linkage for no charge even though its warranty had expired. They should not have in my opinion. My friend was abusing his press.
More important than the press is how you mount it to your reloading bench, and more important than that is how your reloading bench is stabilized. My father-in-law has an Redding Ultra-mag, which he purchased because he has prejudice against Lee products to a small degree, and he proceeded to make a flimsy base for it out of 1/4" plywood that he clamps using C-clamps to his multi-purpose workbench that is not secured to a wall or floor. All of the great strength of the Ultra-mag is nullified by this set-up, yet its ergonomic problems remain. My Classic cast, securely mounted, and my non-use of excessive gorilla force, has ensured that my Classic cast continues to produce excellent ammo for about 1/3 the cost of his Ultra-mag. If I ever do wear it out, I can replace it and still be ahead of the Ultra-mag. If I wear my second out (not in my lifetime I am sure), I'll be even.
Reloading is like bowling, golf and shooting. It is not about strength (though some men like to imagine this). It is about finesse, concentration, and consistency. I learn something almost every time I reload or read these boards. I don't learn, and nobody learns, from prejudice. Form a hypothesis, test it using principles of measurement, make conclusions. Repeat often. This is how we advance in knowledge of reloading.