fearsomepirate
Hero
You are positing a hypothetical inexperienced player who cannot remember to roll an extra damage die whenever they hit, which happens on ~60-70% of attacks, but could remember to roll an extra damage die whenever they hit on a 19, which happens on 5% of attacks.
Critting on a 19 isn't a choice. If I see the Champion roll a 19, if he forgets that's a crit, I remind him, just like I might remind him to add his CON mod to his hit dice or his proficiency to his attack bonus. By contrast, my BM player in one of my other games is quite experienced, but he's prone to analysis paralysis and not using a resource because there might be a better use for it later.
A few highly specialized builds don’t make a feat worthwhile in general, though. Nor a level 3 (the most important) subclass level.
Don't forget about party dynamics. The Champion's crit chance with advantage is 19%, so any party worth it salt should be trying to make sure he has it. Champion/Rogue builds are quite good at getting advantage, and deal rather savage critical hits.
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