I see same champions every game

So we have over 120 champions in this game and only 20 of them are actually used. Every day, every game I see and sometimes or on midlane. I'm not sure when was the last time I've played against and I've missed playing against them. What about botlane? A bit better IMO because we don't have too many ADCs at this time. It's pretty rare to see or but it still happens. and have suddenly disappeared. What about other carries? Are they THAT bad? Sometimes I pick for botlane and people keep saying things like "Ashe is trash", "GG ashe", "bot lost". I'm not going to say anything about but it's funny that I don't see people complaining about her anymore. What's the point of making new skins for unplayed champions if only people maining these champs are going to buy skins for them? What was the point of putting hard work into releasing so many champions if now Riot does like NOTHING to help them? That's how I see it. What's your opinion?

Sorry for my bad English