I actually do use acrobat for legal document work

It good for adding signatures and making changes to pdf format schtuff

If that’s your only use case you can also use Xournal++ on Linux which does the job.

Of course your choice of OS is totally up to you and you don’t have to justify it to anyone, just letting you know the tool exists.

Xournal lets you paint on a document, which I guess isn’t what they need when they talk about legal stuff. Digitally signing a document is still one of the rare cases where I boot up my windows vm. It’s so annoying that there’s practically no way to do that in Linux as my company’s processes rely on it.