You mean leave them off by default? Because that was what Windows did back in the day when the feature was introduced.
I don't know why they lowered the retention limit from 90 days to 60 days but I'm guessing it has to do with reusing old windows bootloaders to bypass things like secure boot (again). Could also be to prevent issues where you install a new vulnerable bootloader blacklist into your motherboard and do a system restore which tries to load a vulnerable bootloader and leaves your system unbootable.
Either way, in my experience Windows rarely kept over a month of system restore point anyway, as it keeps making new ones every time you install software (updates) or update your system. The default space assigned to the system drive has rarely been big enough to keep more than a week or so of system restore points for me.
Windows Me. Why bring up an operating model from 24 years ago if people got used to a different one now, with SR on by default?
60 days compared to the old 10-90 days doesn't sound too bad for most users, especially if it used to be "mostly 10 days". Probably every installer now creates a restore point quickly reaching the disk quota (used to be 10%).
Not sure why it's not configurable though. After all, it's local storage on my machine and my OS. So based on this alone a decision to enforce any deletion policy that the user can't control is MS being MS again.
Windows used to allow way more than 10 days of restore points. When enabled, it'll fill up the storage quota assigned to restore points and delete the oldest one(s) when making a new one in low space scenarios. It has done that for ages now. I believe Windows will use 10% of the drive (max) for system restore points, though often I've seen that number lower by itself (I think when the disk is running out of free space? I don't know the mechanism that reduces the percentage).
Windows now doesn't let you restore restore points from over two months ago. That used to be longer, but they seem to have restricted the maximum retention time for some reason. I'm curious why, but I doubt they just arbitrarily decided to lower the retention time for shits and giggles.