I voted false... in 2e and when 3e was new even a bit into 3.5 I would have said true, but I have been burned too many times.
WotC itself shows that repeatedly they themselves have trouble following there own rules and making fun balanced content (in this case I don't even just mean balanced like a new class... but an adventure that is fun in all three listed types of play too) and as such I have had to think through each new book (it is easier with slower 5e releases) about if I will let them into my games or not... but mostly I do allow WotC stuff.
3rd parties are SO hit or miss. I often use them for inspiration, there are some companies (or people) I have learned to trust, and some that I steer clear of (no second chances) due to wildly good or bad results... but I just don't have the time to check out every 3rd party so lately I just say no... even to the ones I liked. I have 1 or 2 books from 3rd parties I will make exceptions for but all of them are 4+ years old now.
and my group generally feels the same way. Even things I would lable good and let into my campagin some of my buddies would not let me play in theres... so there is a time and money investment that could just end up failing that isn't worth it to me anymore.
If I was 20 again and had no major responsibilities and my bills were lower maybe I would feel different.