Hydraulic lifter preload...who really checks this?

My first Mopar build was a 1978 440 in 2001.
I followed the Mopar Muscle Q & A advice of "Dick Landy" and decked the block .010 and the heads .050. The pistons were stock, the heads were iron. I did use different valve springs but with stock rocker arms and pushrods.
There was no checking or lifter preload with the MP 280/474 cam. I ran the dude pretty hard and and had no problems with it. I later put the engine in another car that I sold. I built another 440, this time bored .030 over with the MP 284/484 cam and Edelbrock heads. Again, no checking of lifter preload and stock rocker arms and pushrods and again, no issues.
That engine split a rod so I built a 440/493.
.030 over, 4.15 stroke crank, pistons .017 in the hole with HD repro stock stamped steel rocker arms and stock pushrods, MP 292/509 cam, new valve springs but once again, no attention to lifter preload and no bad results from it.
Am I just lucky or is there so much of a range of tolerance that I was going to be fine no matter what I did?
I switched to a solid lifter cam later and went with an adjustable valvetrain.
I'm not one to ignore good advice or practices on engine builds but if you don't know , AND if there have been no ill effects to it, the best that you can do is learn from it.