None of this is relevant in my opinion.
The only question is
"is he the best OC we can get for right now since:
1. we have maybe a really promising 2/3 year window with BK and Freeman and
2. we are about number 4 trying to become number 1 ASAP?"
The chances that he happens to be the best OC we can get for 22,23,24 is extremely low as I see it given his youth, his runs on the board (this may be an Australian/cricket term) and his recruiting efforts so far.
If he's not the best OC we can get, who is? Off what are you basing your opinion that he's not the best OC for Notre Dame right now?
I'm curious what the offense would have needed to do last year to convince you not to already write Rees off. Book had well documented limitations, we started the year with RB as question mark, we started a true freshman at TE, and Austin, Lenzy, Keys all missed over half the season with injury. Our clear strength was the offensive line, and we leaned into that for a top 25 offense. It wasn't particularly explosive and showed poorly in the last 2 games of the season, but given the personnel available I can't reasonably imagine a much more effective offense, regardless of the coordinator.
It doesn't seem to me like Tommy is content to run a limited, run-heavy offense either. We brought in 2 QBs this spring (Coan and Buchner) who have the arm talent to open up the offense more than we did with Book.
As for recruiting - for all the (deserved) hype Freeman has been getting for his recruiting efforts, it's worth remembering that:
1. in the 2020 + 2021 classes for which Tommy was OC at some point in the recruiting calendar, ND landed 14 top 300 players on offense and 4 on defense
2. when CJ Williams commits as expected we will have 6 top 300 offensive commitments and 6 top 300 defensive commitments in the 2022 class, the highest rated of which will be CJ Williams.
I do think Freeman is an elite recruiter and his track record suggests he's also an elite coordinator, but I don't think any of Rees' recruiting efforts or offensive results in 1 year + 1 game of sample size suggest he can't be either. Freeman's first defense at Cincy in 2017 was outside the top 80 in team defense and look where he is now...maybe give Rees another season before calling for him to be replaced