update:
after spending literally 2 weeks trying to figure issues with the update to Seq for my 2018 3.2 GHz 6-Core Intel Core i7 mini w/64G, I gave up and stepped back to Monty.
Seq may be auth'd for this mini, but that doesn't necessarily mean it will cooperate with everything.
I had previously updated my 2013 i7 MBA to Seq via OCLP with no issues, but also no PT or anything near as fancy. It works fine.
I did a full wipe of the internal and internet Recovery install of Seq from a boot USB made as Apple instructs.
Seq on the mini 1st got ugly when it wouldn't cooperate with QuickSilver launcher.
Had
back and forth support with the QS devs and couldn't find anything with it. Besides, QS worked fine with the afore mentioned 2013 MBA with Seq.
Then I had an SEP kernel panic, which I'd never heard of til it reared its fugly face. Spent some time with
Howard Oakly discussing that.
I went to the local Apple genii and had them do a DFA restore of Seq.
When I got home, Seq was taking serious time to recognize my Magic Tpad 2 BT. Sometimes several minutes.
Never happened under Monty and still doesn't.
Anyway, having had enough of this nonsense, I stepped back to Monty with a b.u. of my set-up which has been problem free as it had been all long.
Certainly, YMMD, but I do not believe, after this party, that the 2018 3.2 GHz 6-Core Intel Core i7 mini w/64G is necessarily kosher with Seq.
The litter box is easier.