Stagnant Summoner spells

I have seen people people over time asking for a way to remove flash from being a mandatory spell in almost any champion, and while rebalances happen here and there, Riot is the only one I have seen not only refusing to add any more summoner spells, but also removing them, like fortify, revive or clarividence. At this point I think that Riot could even learn from mobile games like Clash Royal about adding interesting spells to spice up things instead of removing or nerfing so you only see the same ones every time in every lane.