time to explain to you how programs work:
when you start a game, in the "loading time", your computer (or laptop), looks inside itself and searches for your champion and everyone elses in that game.
then it downloads data from the server about the map.
depending on your pc, searching data and loading it might take little or not time
next, the active memory about your champions is stored in your RAMs.
Now, here's the issue with your request.
There are around 120 champions in this game. And in any given game, you usually load 10 of them.
That's why, if your desired feature or petition were to be approved. The loading time will be about 10 times longer than your current one for a 5v5 game. OR, about 50-60 times longer than your current 1v1 bot game.
Lets say you load that screen in 1 second. It will now take you 1 minute to load.
Lets say you normally load the practice game in 10 seconds, now it will take you 10 minutes to load the game.
Lets say you normally load the practice game in 20 seconds, now it will take you 20 minutes to load the game.
Aside from this, all the champion information will be stored in your RAMs. You will need to have enough space there to store data about all the champions. So, without like 6-16gb rams, I don't see that happening.
Do you see the issue with your desire or suggestion?
How long does it take you to load the practice game now?
Do you have even have the specs for such a feature?
Because trust me bro. I want a car that can fly, drive on land and navigate on water. And look good. And cost around 5000 euros or less.
But I'm not getting that.
Even right now, air only hoverboards cost around 10k usd. Not even considering the fuel price.
Or a VR game similar to SAO's AoL or Gun Game world.
Sometimes, what you want, its simply, not realistic based on the technology we have today.