If you want a feature added, you have the ability to do it yourself or pay someone (possibly the core developers) to do it directly. Contrast to asking a company like Adobe, where you represent maybe 0.0000002% of Adobe's revenue (based on $20/mo vs $9 billion), what do you think the chances are they'll listen to your input?

If Adobe (or someone who buys them in the future) decides to change their pricing model, or drastically change their product, you have no choice, or you're stuck on an old version (if it still runs), or you just can't open any old projects anymore. With open source, that type of thing rarely happens and when it does, it generally leads to forks (and you can always fork it yourself).

It's really about flexibility, balancing risk, and ultimately, being able to get done what you're trying to get done. Even if you don't use it, the competition generally pushes everyone to keep improving.