How to look at Open Source
How big a project is it?
How many are behind it?
Does it have the money to keep it going?
What is the governance behind it?
If it's a "small" such a photo editing package, a few key developers and a loyal band on of contributors is likely to be all well and good.
Larger or more complex ones, need money and teams behind it, with the design infrastructure behind it.
I've seen some very promising and excellent projects simply fall by the wayside, because the person(s) running it, ran out of money, time or dedication to carry on.
It's OK to say "but you can take the source and do it yourself", but you then have to question, if I'm going to have to pay £30k - £50k a year to get someone to maintain this, is it actually worth it?
I'll happily mix and match OS and propriety, get the best bang for the buck AND best fit software.
Biting the hand that feeds IT
