The items you just listed matter only to people like the posters here. We have philosophical differences with the limitations in place today, but back in the heyday, those limitations were just fundamental gaps in functionality available to users.
With the many major new APIs available to devs over the years and with the maturation of the App Store, those original drivers behind jailbreaking just aren’t there for the most part.
I don't know too may users who care only about a specific aspect of their phone when backing up. I do have non-technical friends who do iTunes/local backups because they "don't trust the cloud", but I've never encountered a person trying to do this piecemeal.
For what it's worth, there are decent 3rd party tools like iMazing that are easy to use and do give you more granular control.
I'd argue it still is.
I can't install a third party web browser that doesn't use WebKit.
I can't select alternative default apps to most apps bundled with the OS.
I still can't unlock the bootloader.
I still can't browse the entire filesystem.
People who espouse the virtues of jailbreaking on iOS tend to forget one big thing... the exploits that are used to jailbreak are also exploits used by malware creators to compromise the system.