Again, what is your point or argument?
I have many years of experience as a manager, coach, President, BOD member, in addition to spending 16 years and counting as an umpire. I've umpired hundreds of LL games (all levels) at the local, district, section, sub-division, division, and regional level. I've also worked a number of years as a volunteer at WR.
I also umpire at the travel-ball, HS, and College summer ball levels. I've seen many All Star teams, worked many All Star games. The fact if the matter is that the caliber of All Stars in LL has diminished greatly.
Getting rid of MPR in All Stars (and other cumbersome regulations) would help re-attract quality players and coaches, and bolster the competitiveness. IMHO.
What would be some of your ideas to increase enrollment and competitiveness in LL?
Getting rid of MPR would cause kids to not want to be on the team and/or parents not letting them be on the team. Been there. Not pleasant.
It's about winning, but not to the point of exclusion.
And don't forget that the other team is under the same rules. You aren't losing advantage by having to play your subs because they have the same constraints.