I agree that category fragmentation is something to avoid, but as this most recent example shows, it is less than clear where to post feature requests and how to communicate them effectively. Only a minority of Ubuntu MATE forum users are developers, yet many of them have good ideas on how to improve the system.
My recent suggestions are essentially aimed at bridging the gap between feedback and development, of having ideas and how to implement them. The more participatory agency there is for average users, the easier it is for them to tolerate bugs and difficulties. This is something not to be underestimated, especially when wanting to keep users engaged with improving their operating system and to remain active in the forums.
Since there is already a tag named bugs, why not add another one named #feature requests. While this would not guarantee that any feature requests are implemented, they can at least be more readily discovered through a tag search and invite further participation. Now that I think about it, this seems to be a better suggestion than renaming an entire category. Thoughts & Feedback and Development Discussion are good as they are.