At least Ext4 repeats the complete superblock at the beginning of every block group, so yes, it is not only remotely accurate, but entirely accurate. In the case of GPT, Linux requires explicit command line options to enable alternative GPT use, but do you know this is true for all systems in existence and all versions of Linux?
> Rebooting and re-detecting everything between partitioning and mkfs is not part of any ordinary OS installation procedure
Yes, I've personally bumped into this on desktop and unattended server installs - numerous times.
But you're externalizing the onus to prove cases where some hacky approach won't ever break when there is a vastly simpler way to avoid this entire class of problem. This is exactly the reverse of sound logic -- I'm offering you concrete real world examples of why you should avoid the hack and you're simply ignoring them
At this point I'm considering this not only to be offering up worst-practice advice, but actively trolling. Possibly the worst case of "a little knowledge is dangerous" I've seen recently. Regards