No we all just have to move on to next generation rooting an modding. Magisk can be flashed, or the Manager App is used to patch the boot.img manually and flash it afterwards. GSIs ROMs can be flashed via fastboot from fastboot mode as well. So in my opinion it is fastboot flashing an GSI.img, Custom (optionally Magisk patched) boot, or Stock Magisk patched boot. That's it. It's even more, as it's back to the roots of adb and fastboot. TWRP has been there on U12+ for as long as the device exists, bit I never used it, as I switched to GSIs instead, and of on Stock the Magisk ROMs of LeeDrOiD and Team Viper could be easily installed through Magisk Manager. We should all have taken a look at phhussons work much earlier to accommodate to the things that got moving by Googles change in architecture when they introduced treble. We've only been to lazy, and many of today's users on this board, hardly know anything in-depth about adb and fastboot, but only scratch the three or four superficial standard commands. Technical affinity is more in demand again, and our good old adaptability.
I agree on most points of you. GSIs are wonderful especially for phones at release start when there are no custom roms available yet.
And luckily device specific custom roms can be flashed over fastboot, too.
But for one reason i want a twrp for our device:
I find data backups with twrp much more easier as without. At least on my pixel 4 xl i miss a twrp somehow because Titanium Backup doesn't work on the gsi which i'm using.
I must create all my app folders again on my phone when i update it and backup all my stuff manually on my pc in extra folders and files.
I could spare me all that with twrp.
(I know there is the Google Cloud too as possibility but i refuse to use it)
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