Thank you J.Michael for the detailed response! Definitely helps my understanding along quite a bit.
Oh of course, that makes sense - I skimmed the instructions for the non-Samsung section and missed the reference to fastboot.
That indeed does appear to be the case, I have downloaded the Magisk .apk and checked, I am seeing "Ramdisk: yes" for Lineage. (And believe from a tutorial I saw running through the installation on a stock S10+ that it's a "no" for that.)
That was certainly one of the sources for my confusion, had assumed Ramdisk is a hardware property, but turns out that I assumed wrongly.
Yes maybe I was exaggerating by that choice of words.
It does say 'deprecated' on the installation guide. In any case I'm probably feeling better following the image patching approach.
So I downloaded LOS
from here and it's provided as a .zip file with a recovery image as an .img file. My understanding is that is can be made suitable for installing with Odin by simply renaming the recovery image to recovery.img and packing it into a tar archive (many people in the
relevant thread for the ROM and more so
the previous version report so, and the maintainer specifically says so), however I used Heimdall (following
these instructions).
The main reason I got confused which path to follow was that the Samsung section specifically talks about using Frija or similar to donwload a Samsung firmware and I assumed some of the following steps are specific to it - namely, looking into that Lineage .zip archive there don't appear to be AP, BL, CP, CSC files inside it, so I'm not sure how exactly that would work with Odin – will need to read up on that, but it's definitely a thing people successfully do - so I'll attempt to educate myself and try that.
(I think a similar question was asked
earlier in this thread but don't think that was answered.)
I'm not sure I follow this last sentence - what do you mean by the 'tablet'?