Correspondence/Daily secondary time limit (per move)

A nice (optional) feature/setting for correspondence games would be having a secondary time control. So the primary time control is: how many days (e.g 3) you have to play the move and then a secondary time control limit per move (e.g 15min or 2 hours, etc). So in the e.g you have 3 days to play your move but only 15min thinking time per move.
(While you have the board position open/active in front of you the timer counts down your time.)

This would stop big asymmetries of play time being a factor in games... e.g 1 person thinks for 10min per move -- another player 1 hour.

It would be crucial for correspondence tournaments.

No interest, you might as well participate in an arena

The limits can be big 5 hours per move or even bigger.
The idea is to make sure players have equal time to calculate.
(It would be an optional feature).

So what's the point of the three days if you can't think with the agreed upon time control?

To spread out the moves over days.
Say the time control is 1 hour per move... who has 40 consecutive hours spare to play a full game? It's impossible.

It has to be broken up into chunks over many days.

The main idea, as I mentioned, is matching with people who will use similar time per move to you. If you spend 1hour per move -- do you want to be matched with someone who will use 10hours?

When I select a time control, I know some people will use more time than others. If I want a faster game, I'll pick a faster time control. This seems impractical to me

This system will allow accurate matching of players that use similar time.
What exactly is impractical about it?

Because no matches up based on "time usage," they matched up based on time control.

That's like me searching for a 60|0 match, but only wanting to play against people who average 1 minute per move.