Consider Sony Xperia 1 series then, they always have fully open policy regarding to unlocking and rooting with no deliberate restrictions whatsoever, took me less than a minute to root my Xperia 1 VI shortly after I got it. Also their very AOSP-like ROMs make modding much easier too.

Also I bet you don't find many other flagship phones in 2024 that still have both SD card and headphone jack lol