I have a codebase that covers 32 years since 1984, if you count UCSD since 1981. Sometimes that code is still useful or insightful (because I used it in university for scientific problems) .
Also: TP mode is supported and at least once a week this forum get a question about old school style Pascal.
And... it's fun to play with dosbox. I also have WordPerfect running in it because I miss the underwater screen...
I see. Well… clearly we have different kind of needs with Pascal. It's alright.

In my local Pascal community, I seriously discourage the use of Turbo Pascal because it's a dead product and practically a dead Pascal variant. I can understand the need of TP mode in FPC to keep the legacy codes. But I don't see any benefits of using it (both TP and TP mode) for study or new development.
Instead, I highly encourage the use of modern Pascal, especially using FPC with either Delphi mode or FPC mode. Because I don't want new programmers see Pascal as an old and limited language by still letting them use Turbo Pascal (along with DOSBox). Pascal has been known as a dead language. Today's programmers have taken that for granted. I don't want us to support such false notion.
I want to show them Pascal is still alive and kicking. I want to show them that we can build anything on anything using (Free) Pascal. Desktop app, web app, mobile app, on Linux, Mac, Windows, anything… you name it. Those can't be done using Turbo Pascal, obviously.
You can even write Pascal program from within a browser without Pascal compiler installed on your local machine. Today is the age of cloud computing. Pascal is able to do that too! Like shown in the image below…