I agree the Restore options make bootable backups less important.
The time required to restore a system using Thunderbolt devices with an appropriate Thunderbolt cable is shockingly short.
This might depend on individual situations.
Where I live, internet download speeds are 7MB/s on a good day, and 5MB/s or so on a less good day. We don’t have fiber optic cable as is available in Cupertino and elsewhere, which may be coloring thinking about how “quick and easy” the Apple way is.
If I need to download a clean copy of the current OS, which for Big Sur was around 16GB if I recall correctly, it’s a long overnight process. If I have made a copy of the OS and kept it on a thumb drive, as has been suggested, and is certainly one way to do this, to boot from that and use that in combination with Time Machine, the only way I can keep the thumb drive as current as my bootable backup current is to keep erasing that thumb drive over and over and over and repopulating it with the newest version, which again takes forever to download,
where I am. PITA.
Then, at least when I have done it this way, starting with what the computer thinks is a new OS and Migration Assistant, I am starting with telling it what language I want to use, what Time Zone, etc. Perhaps there is a workaround.
PITA. It’s anything but shockingly short.
And let’s suppose that the reason my Mac crashed and became unresponsive to any and all administrations available in the Apple handbook is that I yesterday had downloaded Iranian goat porn which contained a worm which was excited when I tried to access my nuclear codes. If I don’t have a clean bootable backup of the system I made
when it was operating perfectly , and, instead, spend 8 hours downloading a clean copy of the Current OS and then use Time Machine to repopulate all my files, then the computer is still going to have the goat porn on it, because it is completely up to date, which is a potential issue with using Time Machine, which I am hardly the first one to mention, though that is not unavoidable.
If, otoh, I have a cloned, bootable backup, I am up in minutes, and not many minutes, and the OS is as up to date, with all the current security updates, as well, because it’s a clone of the system and files, made when there were no issues. I will likely have lost a bit of work done right before I made the backup, but that’s the tradeoff I am more than glad to make, in my case.
If someone isn’t limited to 5-7 MB/s internet speeds, and most are not, then starting over from scratch can certainly make more sense. It’s nice to have workable and approved options, instead of being told by 30 something year old coders, that live in the land of GB internet speeds that “You shalt not!”. I’d rather that Apple allowed Time Machine to make bootable backups, but, again, am sure they have their reasons. I’m also sure they could make this happen if they chose to, because they have the best computers, and the best minds, “creatives” as they keep reminding me. Surely it’s just a matter of time, as soon as they move some people over who are currently busy in the emoji department.