For example, it's a tiny bit of a pain to quickly and cleanly access subscribed communities. There's a "subscribed communities" box beneath the right-hand sidebar for the instance you're in, but it seems to me like it should be a stickied item on the left-hand side of the screen, like this:
The issues section is the correct place and should be considered to be the dedicated forum for feature requests and bug reporting. It's designed for that sole purpose and gives instructions to issuers on how to reduce load when making a request. The devs will prioritize issues as necessary.
A Lemmy post or any Reddit-like forum in general is not good for requests since the posts will be forgotten over time unless they get cataloged on the issue tracker.