This isn't a legitimate gripe, and it's a series of garbage assertions.
There is a certain point at which coaching stops and execution takes over. I've never taught a guy to hold, but I've had guys get called for holding. I've never taught someone to ease off during a play, but I've seen it happen more times than I can count. I've always made sure that everyone that will see the field knows exactly how to not only carry out their basic assignments, but also how to adjust based on different things...and yet I've seen plenty of guys miss assignments no matter how basic it is.
If someone legitimately doesn't have the fundamental or strategic knowledge to carry out the most basic duties related to football, that's a coaching thing. But a guy dropping a pass because he's taking his eyes off the ball isn't a coaching thing, a holding call isn't a coaching thing, an illegal shift isn't a coaching thing, and a guy not being on the line (or being on the line, as it may be) isn't a coaching thing.
When you have a legitimate gripe with coaching, I'll let you know. Trust me.