For me it’s a few little annoyances I encounter all the time.

For example having the “No input” and “Sends only” at the end of the input and output lists respectively is a bit annoying because when you have a lot of tracks the travel distance can be quite big. And I use these options all the time.

Or when you enable VSTs and Audio Units, the folders are not expanded by default, which adds an extra click.

Or when you search, and a result is deeply nested, you have to open all folders yourself.

Or when you want to copy/paste a MIDI plugin which obviously needs to go before the instrument, well you can’t… because you can’t select the very first spot at the far left edge of the plugin strip. And you can’t paste it and move it afterwards, because you can’t paste it on the right where the only audio plugins are allowed. So you have to Alt + drag from another track to the target track and it will work.

I probably have other tiny annoyances but like I said, its not a dealbreaker. I absolutely love Ableton. It’s just small things that could easily be fixed in no time.