So you are familiar with PC gaming and are no stranger to RPG Maker. Then your choices are even more bizarre.
Picking free games by solo devs and roasting them on a stream called "Itchio dumpster" is how you HELP them? Gee, go help Blizzard or Koei-Tecmo, they really could use someone to set them straight and they actually can afford to have a few employees to do nothing but address your UX nitpicking throughout the entire development cycle.
Of course it's not impossible to do this or that even on RPG Maker, but first of all, it's time consuming. Making The Lonely League as it is took 3 years of work, me and a handful of fans were following it for all that time, wondering what it will be about and how will it play, knowing Calunio's unique style. So I'm not so sure you're as familiar with gamedev as you claim because you don't consider that every new moving part is likely to add bugs, which due to the way the engine is built might be a pain in the ass to track or require ridiculous workarounds to fix. Something a player would take for granted or only 1 in 50 would use can take dozens of hours to integrate, test and fine-tune, and then it can break something who knows where and good luck tracing it back to the wonky plugin you spit-glued to an archaic engine so that 3 people out of 150 of those who'll ever play it can rebind keys. And then someone like you will ridicule the game for not accommodating their ultrawide monitor, AZERTY keyboard, Steam Deck, color blindness or RPGM interpreter on their phone. The difficulty is fine as it is, too - it could use some balance tweaking here and there, but making it easier or harder fundamentally would ruin the only thing it's built on and makes it fun - the principle of "thinking before you act", which is all it takes to win in that game. Everything is there - enemy stats and abilities, interactive objects on the map, your own strengths and weaknesses, and all there is to do - keeping those in mind and not doing dumb things, and even if that fails, you can always grind consolation XP. The game doesn't require reflexes or ability to memorize attack patterns and react to them under pressure, it doesn't need to accommodate to common limitations of many gamers. The only thing it requires is thinking and paying attention, and if that's not your strong suit, might as well watch someone play it on Youtube for you.
There is no limit on how many options you can add, how inclusive and accommodating you can make your game, and those things are not fun to work on and come also at an expense of additional actual content the game could have gotten instead or time it takes for it to be ready for release. A big company can dedicate some junior employees to those tasks, especially when the company owns the engine they make their games on and has all the freedom to tweak it to their needs; a solo dev has to prioritize, and it's not like I myself happened to be happy with everything in TLL and think that since it worked for me your pet peeves are invalid - I play with a controller and controller mapping is downright random with no way to fix it, no on-screen button prompts to remind players what does what at any moment either, but I just got over it and finished it just fine. I didn't showcase it on a stream as something I fished out of a dumpster, found petty reasons to complain about, read character lines from first to last in a ridiculing tone and then claim I'm helping the dev to be better at making games.
Man, I doubt you helped the dev much, but you sure helped me to not feel so bad about never managing to finish a game of my own and putting it out there.