Until MicroHard forces a Losedows update that breaks something.

No one needs a Microsoft OS to run Windows games let alone DOS games.

Inventory Game Additions.

Question:
How often does GOG update and add new games to their Inventory?

^that ... and the thread is not about compatibility anyway (one can run DOS games on a rasperry pie too), but about ownership and/or DRM.

1. depends on the game. There is no reason to updated DOS games since they pretty much remain the same anyway. If DOSBox will ever get a new final release, they may replace update DOS Games to replace it.
They did that for example when ScummVM got a new major version that fixed some emulation bugs. Some games got the new VM, others which previously were not supported, were moved from DOSBox to ScummVM (it's just so much more comfortable and has more options).

I usually install my oldie games, then move the game data into a directory for all my DOS Games (or ScummVM games, depends), then uninstall it again. But just install and run works as well of course. This is just my personal preference. I like to have all my DOS and ScummVM games in one place.

You can check the update history of your games here:
https://www.gogdb.org/

2. Constantly. Every couple of days we get new games here, sometimes newer ones, sometimes older ones, it really depends on what they can get their hands on. We just got a few new Piko oldies for example.

Very good point! It's not something that I've thought much about (largely because I can't see a circumstance where I would delete my account - I could see circumstances where I stopped buying new things, but I can't where I'd actually delete the account)

Well, it is a rather hypothetical question (just letting my mind wander a bit), no one will ever stop you from using your old offline installers.
But if you wanted to download them again by creating a new account, that would not be possible,

It's always nice to see someone come to the realization and be reminded of why we all came to GOG in the first place.

i came here for the retro games

This! The most important selling point of GOG are DRM-Free games with offline installers.

Are the games yours? No, they are mine! I just have you download and keep them for me on a perpetual life-time loan. *evil laughter*

Of course they're yours, that's the whole point of having offline DRM-free installers.

LOL

If you haven't been told yet.
Check your spam for the memo ...

YOU OWN NOTHING AND YOU'RE HAPPY!