Ah, yeah, it's a rare Samsung tablet that has real lineage support these days. The last one I used was the tab S5e and performance vs the S6 was so bad that I pawned it off on a relative within six weeks. I'm using stock OneUI with magisk on my S6 and S9 which means downloading the entire OneUI image from Samsungs update server, decrypting and splitting it, then patching with magisk and kicking it back over to the laptop to flash parts to the device with Odin. It's a lot more work than updating an AB phone.