bvchildanimfix:
I don't have BV but did, eh, acquire FT. Do I assume the animations are also/still busted in FT since this is in the FT pack?
Yes, it apparently is still broken in FT.
ditto the orchardtreefix, assuming Orchard trees came with Seasons (which I also acquired).
Yes.
It's described as fixing a break introduced by Pets. Well, I don't have Pets (nor do I want them) but I do have and use the Businesses in OFB. Is this one of those cases where it won't hurt anything to have it in and/or will harderjobs & OFBfixes suffice? (Well, I don't use harderjobs, but still...)
Jobfixes covers brokenness in jobs that persists to this day, hence why the "pets" label was removed.
antivacationactions, bedsidefix, and vacationfixes
If you don't have BV, you don't need to worry about antivacationactions, but other fixes are still in there. It does not hurt to install the fixes, as if you have a more recent expansion, the code is still THERE.
snapdragonpets:
I can't find a rtfm for this, but the description in the doc from the OP suggests this is only applicable if I have the Pets EP?
Well, it doesn't do anything useful if you don't.
uni_ltws_sns:
Is stated to work with Uni+Seasons "only". Reading that literally, as I tend to do, why is it in the FT folder? Or, what does this do that the ffsdebugger can't?
RTFM is old, works with anything Seasons+.