When I first started playing AD&D, back in '81 when I first went to university, we all had a lot of time on our hands. We could play as often and as long as we liked, and as a result our campaigns tended to be very long-lasting and wide-ranging.
What it has taken me an unreasonably long time to come to terms with is that that situation no longer applies. people have lives and obligations and things to do besides playing D&D.
Even with a schedule of only playing face-to-face once a fortnight, it's not unusual that somebody won't be able to make it from one session to the next.
What this means for me, as the DM, is that I can't really expect to be able to run an extended story-arc campaign any more. Any adventure I present pretty much has to be capable of resolution, one way or another, within two or three hours of play.
That's a bit limiting of course, but it's not an insuperable creative challenge. It just means that we can't indulge in any sort of leisurely build-up to the action, and because the length of time between sessions might be long, any foreshadowing may well be forgotten and wasted by the time it becomes relevant.
Essentially, what it means is that we're going to have to play in an episodic ST:TOS framework, not a series-long ST:DS9 story arc milieu.
On a side-note, apparently D&D (et.al.) is taking off in retirement homes across the USA. It's proving to be excellent for providing a social focus and engagement for retirees who would otherwise risk isolation, as well as being excellent for cognitive maintenance.
I imagine it would also be good for actually running a game, since unless somebody has died in their sleep, you can probably rely on them actually being there. Which is by no means certain or even likely out in the real world.
Addendum: I bought a second copy of the AD&D2e PHB softcover reprint from DriveThreuRPG, since it seems we need more than one at the table, and everybody else is too goddam cheap to get one of their own.
I have a copy of the 1989 edition hardback, but the page numbers are all different to the fancy-schmancy 1995 "black book" edition, which I prefer. I have an original one of those too, but for the hurley-burley of the tabletop I prefer to have something that's basically expendable.