Surely it's not just our use case, but we have just upgraded from v15 to v16 and I feel like the "improvements" Odoo is making to the UI are from the developers perspective and not the end user's. 

With every update, I feel like things get more pointlessly confusing to use and visually confusing for end users (including myself) as they remove visual queues or make other changes that don't seem to be well thought out for people who actually use the software.

v16, they made the contact name field pointlessly short, it barely fits a normal company name, its not like there wasn't much space on the contact card. Why change it? It worked in v15.

The Auto-Saving? Users are constantly accidentally changing things and then proceeding to the next record being none the wiser that the changes they accidentally made have been saved or applied to the previous record.

With the auto-saving came the removal of all visual queues as to what fields are in an editable state and which are not, which results in a huge amount of wasted time from the users end. You can also no longer click through to the linked record you must locate and click the small arrow at the end of a record. 

I feel like by V20, we're going to be using SAP just with different colours. 

Is there anywhere we can log improvement requests/complaints?

We are a high growth organisation who's user count continues to grow.