Crash log that the game/buffout4 prompts me to create: https://pastebin.com/raw/zQSWxAiB

Seems pretty random as far as what is going on, or where I am.
Potentially related is that transitions to the world from an interior take a LONG time (minutes) compared to vice versa or interior to interior.
Furthermore, sometimes the game will just sit at a transition screen forever. After about 5 minutes I just kill the process.

These symptoms are unique to FOLON, as even a moderately modded FO4 didn't give these random crashes or LONG load times.

These kind of crashes (while fast traveling or changing locations - using doors/exits) are well known.
Also kind of documented.
On this forum are various guides, promising to tackle exactly this issue.
I won't refer to any particular one, as some suggest reinstalling & following very specific course of installation steps, others advise to download extra fix-mods from nexus.
So the reactions on the fixes vary, some positive, some negative.

Which leaves me in disarray, which is the is truly ultimate one.

I followed the one that advised the nexus fixes (mods), and I basically agree with the reply of other players : "it does not fix the issue, but prolongs the period between crashes"
In my personal experience, before, the crashes were as early as 10 minutes into the gameplay, after applying the 4 specific mods, I could play for 2+ hours (which I deem acceptable)

Other fixes claim to not just prolong the negative effect (drop to OS) but ultimately remove it {and promising flawless gameplay, till one saves & exits} - I was not testing those, because I was lazy reinstalling.

TLDR: there are ways to address crashes, and can be found on this forum.