If you read the framework this is addressed.
In my experience 100% of people opposing the framework haven't actually read it, and they just assume that the no tackling and no trophies is a nanny state "every child wins a prize" initiative. This couldn't be further from the truth. There is a lot in the framework and it is based on 30+ years of research across dozens of sports and social/developmental science.
Specifically for grand final days, one objective of the framework is to increase the amount of kids who get this positive "end of season" experience. In an u10's comp you might have 200 kids, but only 30 get to play that extra game and only 15 get a trophy. If you run gala day at the end of the year, all 200 kids get to participate and finish the year on a high. Even better, if you take the comp scores/results into account, you can grade that gala day (as best as possible) so that teams are playing opposition at a similar level and everyone comes away from that day feeling like their team had a good crack and was competitive.
Remember that the goal of community footy is to bring back as many of those 200 kids as possible - and that the kid who ends up as the best player from that group of 200 in ten years might be a middle-of-the-pack player on a middle-of-the-pack team. If you are thinking about long-term player development, the best outcome is having that kid
play more games even if his team isn't good enough to make the finals.
Right now u12's is a bit of a black hole in the framework because they don't do galas - but in Qld some leagues have realised this and filled the gap. There are a couple of really big school-holiday u12 carnivals which teams can participate in. By all reports these are a wonderful experience. I coached u12's during a Covid year though so unfortunately it wasn't an option for us
As far as the "no tackle" is concerned - I do see people's point of view on that. Some kids just love the rough and tumble. The NRL and the clubs do a great job of the transition though. The kids are learning how to tackle from day one and they play tackling games at training. They just don't do it on gameday until a certain point. For a lot of kids that's 1- 2 hours per week where tackling is part of the sport, and 16-32 minutes per week where it isn't. We aren't harming their development by holding back tackling on gameday.
Personally, I loved coaching in developmental comps but hated coaching in premiership comps. A lot of parents turn evil once the scores matter (well, when the scores matter
and you aren't winning that is). Club administrators too.