…why I am continually invited to meetings at work and expected to contribute, only to have every. single. suggestion. dismissed out of hand, as if I never said a word. "Oh, but we're a team and we value your input!"
Yeah, whatever.
You reach a point where you don't even care anymore, having pointed out for months the same thing again and again that's not working, and while they promise to fix the issue, it never gets fixed.
(An example I've been complaining about almost since the day I came on board is the fact that my colleagues work tickets and don't bother assigning said tickets to themselves or even closing them when the work is completed. Me, thinking they're just hanging out there open, contact the customer and am told, "Oh, Chris took care of that weeks ago." I've brought this up so many times during our team meetings that I'm not even bothering to discuss it any more because I know it's never going to change.)
Thus explains the world.
I don't know which area of business you are working in, but it seems that none of your colleagues have heard, and furthermore used, anything from six-sigma problem solving methodology. It's worth being trained to it, no matter the scale of the company one works with, for it is really effective when led by a committed (and smart enough 🙂 ) person.