A bit of nostalgia.

No, it's much more than that. It's form, function, utility, and possibilities not present in modern software. Newer isn't always better.

A lot of software or features have been discarded in the name of "progress".

You can use modern software bit it's not a given that you'll be able to do everything that you could in the past, or that it will be as easy and straightforward if you can still do it.

Perhaps it's surprised to hear that there are things these old apps and operating system can do that no modern software can do as well? Drawing in dither patterns is one (useful today for platforms such as Playdate), but there are many more.

Very interesting.