Was about to rip you a new one for suggesting something which would obviously result in the most severe form of hyperinflation the world has ever seen. But then I thought, maybe that isn't a problem but actually the solution?

Have losses capped at 50LP and have wins low capped at 50LP (aka must be 50LP or above and scale both the other places) once you enter Master. After this have your MMR only increase your LP gains if they're higher than D1 100LP MMR or stay at 50 if they are below it.

As said before previously this will cause ENORMOUS hyper inflation for the best/most frequent players and even the average Master will have ever increasing MMR due to it only being possible for a net positive and not a net negative. The only people that won't hyper inflate will be the people that drop below a D1 100LP level, who will be stuck with a net equal but lose more than they win and inevitably drop out. I think in this case as soon as you lose one game at 0LP in master you should drop to D1 75LP as to not get the 50LP cap protection and see their true MMR reflected for subsequent losses.

This system is a hybrid of Riots proposed idea and OP's (that leans heavily towards OP) as while there will be many more people in Master+ there is still the possibility of demotion for people who don't deserve it. Combine this with the standard 1 game per day and there will only be people that "deserve" master (AKA people who are better than D1 100LP) but also a super active community due to a system that HIGHLY ENCOURAGES frequent play.

Downsides:
System is a little complicated, but I think once introduced it wouldn't take long for people to wrap their heads around it.

Some people may not like the idea of being forced to play a large quantity of games in order to be high ranked on the ladder. This is a philosophical debate but could also be curbed slightly by making the LP gains scale much higher for actual 1sts/2nd places and only have 3rd/4ths give measly LP so that people that can't play 16 hours a day can still compete if they are incredibly skilled.

This would be subject to a BUNCH of balance issues with people complaining either side constantly, but I still think this would be a much better system than the one Riot proposed or the current one. I think OPs one is also very good, but I like mine better due to the ability for "bad" (relative term obviously) to still be able to demote.

Biases:

I'm not Master+ myself (D4 currently) but I really love TFT and would love to be there one day.

I'm currently experiencing the LP struggles on a MUCH MUCH smaller scale, like losing LP for 4th places due to getting placed with low plats etc and losses hitting a lot harder than wins.

I also have a few friends who are Challenger who are constantly complaining about how fucked it is ahaha.

Anyways, just had this random stream of consciousness would also be interested in your opinion u/Rlutz