I don’t know so much about EGS, but probably some of the following (most of which I don’t use very often, I hope I recall correctly)

• Refunds
• Family sharing of games
• Sharing games for other local users
• Being able to lend games
• Remote Play (with friends)
• Remote Play (stream for a local machine)
• Linux support through proton
• probably more?

Freecad is getting more and more attention. When version 1.0 releases (soon), it will be something worth checking out, but there is still work to do.

It depends on the use cases. I don’t like how this post makes it look like the “Linux” alternatives are drop in, one-to-one replacement. Inkscape has been immensely useful to me, but for professional work, it might not be a reasonable replacement.