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

Have not read 50+ threads, but professional engine builders have had failures. So it is not break in procedure, wrong oil, heavy springs. It is the lifter quality. I have a set of Crower [ well, they came in a Crower box ] start to fail after a few hundred miles. The lifters were spinning, which can be seen from the wear pattern. They were soft & that was the problem.
Use re-faced factory lifters & you will not have a problem.