Not everyone can dedicate that much time, and not everyone wants to dedicate that much time, and people shouldn't have to dedicate that much time.
But they should make it more friendly to mobile players so that they have more time to practice basic techniques before fighting pc players.
No, the game has to be equally fun for both platforms, and equally hard for both. Mobile players shouldn't receive extra time to learn, they should not require more of it than other players in the first place. Either that, or they should be placed in an environment where such things don't matter (such as simply separating mobile players from other platforms).
Players also shouldn't have to "practice" to just be able to play. All a player should ever be required to do to reach at least an average level is the ability to improve passively from just joining normal games and playing them, without any practice, without looking up tutorials, etc.
The only time you should ever be required to practice is if you want to play on a very high level.
So the way to solve this is to either separate them so this way it doesn't matter what platform you're on or nerf PC so bad that mobile players are not at a disadvantage and because the second option would ruin the game for a lot of players AND would be extremely hard to do well in the first place, the best option is just separating them.
This is better for them too as they get more challenging fights.
That's not necessarily a good thing, especially given how casual most of cubecrafts playerbase, on PC or any other platform, is.
