If you are building an engine today (~2023), Professionals are not building Hydraulic FLat Tappet camshaft engines? Don't try?

An engine builder builds x amount of engines a year they will see more failures. I have built 4 engines in the last 20 years and have one going together now as a hobby /part time builder. I haven't seen any failures. I do believe the tappets are coming through truly flat and that is an issue they need to be convex so they rotate. The parts are being made bad. I had a rod bearing without the oil hole drilled into the halves. I had to make it myself. The parts need to be inspected as the engine goes together, and you have to know what you are looking for. The engine builders are pushing roller cams so their life is made easier...they don't want to check 16 lifters for the convex bottom on every build. i went through the same crap with my plumber he wanted to install PEX because it was quick and easy I told him "Ill sweat the pipes in I want copper..." In and out at half the time for the same price you'd charge for a days work unh huh...