This has been an ongoing problem that they didn't properly address for years. The issue is that they should have redirected more effort to this and done it earlier. The two champions a month after the 70-80 mark was a mistake, they should have throttled champion release to 1 a month years ago, and focused on reworking and remaking existing champions concurrently.
The effort they are giving now is exactly what they should have been doing two years ago, now they are just really behind and flooded with champions which makes it too hard to maintain.
The other problem is that they have some unhealthy agendas that prioritize Esports over healthy gameplay. Esports is an insignificant fraction of the player base, making changes based on how 0.001% of the players experience the game is flawed. On the opposite side of the spectrum though is the newb catering changes which are designed to satisfy the bulk of unskilled players so they can draw in New players.
That is a problem because plenty of healthy champions are branded toxic just because players who don't even know how to play are unsatisfied... These nerfs account for most of the ez mode champions which were nerfed into oblivion even though they were balanced. They need to stop that nonsense honestly. The game needs more modes and methods of play outside of the regular competition, bots make a good alternative for bad players, but like many strategy games, there should be a suite of single player content, not just to offer some content variety, but also to present new players with a battery of challenges to train themselves and qualify their abilities.
Now more than ever, there are entirely too many champions for new players to learn, let alone try. A good single player experience could be designed to let players experience dozens of champions in concert and learn how to operate tactics from unit control, skill use, opponent negotiation and so on. Without that, they will have this broken gap between the competitive balance of the game, and entry level expectation for new players. Balance decisions can not be made for uneducated players...
