Is having your tank go from on the offensive to "oh shit" run, while your opponent can be in full retreat and suddenly see that crit and understand I can now yolo into my opponent with signicantly less threat, a fun mechanic? No.
If you're on the offensive and your tank is at 25% health or less, your offensive isn't going as well as you might think.
This crit is no different then T34 having lucky streak on OKW P4, penning it each time frontally when P4 can't even hit T34 - these situations happen equally often.
Sometimes you have luck on your side, sometimes you don't.
Without that element it would just be another generic ww2 rts and even these have RNG in some form very often.
Removing RNG is the same as removing synch kills from DoW2 and not even implementing it in DoW3, yeah, it increased competitiveness, but took away the features that identified the game and made it stand out, resulting in predictable, plain, generic game.