That's device specific however. Pixels, yes, but say a Samsung device? Not any more - they nixed bootloader unlocking.
There are enough unpatched Linux exploits (known and unknown) running in the wild to make most phones rootable/flashable for years to come.
alt Hacker News
There are enough unpatched Linux exploits (known and unknown) running in the wild to make most phones rootable/flashable for years to come.