Well, if people decide to lock themselves into eco systems like the one Adobe provides... Not saying GIMP (for instance) has 1:1 feature parity or anything. Not at all. But to me, those are just tools to get work done. And I can use a slightly different tool just fine, even if it's a little rough around the edges.
But I'm a programmer and systems administrator, not a designer.
If you're into pro video editing and animation, you have to switch software if on Linux. If that's too complicated, requires too much time or you can't get any plugins for the software you use, than yes, Linux is not for you.
But, let's face it, for your every day Joe, Linux is just fine.