Ok, when I say competitive players I'm mostly talking about players who do things like take spammy net lists or won't let you shoot after you forgot, obviously I don't think that casual players don't care about winning (and I think hardly anyone else would either). Arguing about semantics like this doesn't really advance the debate at all.
As you said earlier in the thread having the rule there already makes it easier. Sure casual players could just ignore rules that ruin what they want to do or come up with new ones, but the exact same thing can be said of competitive players. As has been made clear GW doesn't want to deal with writing for real competitive players so it makes perfect sense that the rules reflect that.
As far as comparing this to games like LoL and SC2. Not only is there MUCH less to balance in those games compared to 40k (just think of all the different factions, units, and variations on those units), but 40k is also a physical game. Think of how mad some people get when a new codex every couple years can make their favorite models "useless", think about how awful that would be if it happened monthly. Sure other miniature games be this as well but they typically have smaller buy ins and/or smaller model counts. Having to replace one warjack is much easier to take than replacing 10 man units.