[slayer-pantheon-rainbows]
Riot's Philosophy (By satirical induction):
We appreciate our community content creators! Lets release our own vastly inferior Baron Replays that makes editing videos a comparative nightmare! Then lets ban folks who still want to use the third party program (Don't fix what isn't broken?)
Source: https://www.reddit.com/r/leagueoflegends/comments/97iamx/why_i_hate_making_league_of_legends_videos/
We want role diversity! Go where we tell you to go dammit!
Source:

We listen to fans when making reworks! The hell with you Kayle fanboys we're doing this MY WAY!
Source: .... I miss being able to be a guardian angel. Or a champion at all before level 11. Or being properly ranged. I don't need an idiotic unstoppable true damage gimmick, I want to play my favorite angel without needing to bring lube or a pocket jungler!
We don't balance exclusively for pro-play/high elo! Yi/Jax/etc. are only a problem in low elo! How dare the unwashed masses be able to play
without living in constant fear of nerfs, and sitting at 40% winrates (Sej is at least playable now)!
Source: Sej/Shen patch history for the entirety of season 8. Sej in general post-rework.
I'm Scitzofrenic and so am I! The beatings will continue until morale improves!
I'm not sure they have a cohesive philosophy so much as a barrel of poorly directed good intentions that are making the game quite frustrating at the moment.