It actually is an input field, but it can be interacted with in 3 ways. Clicking on the value focuses it, and allows editing by keyboard. Clicking and dragging in the bottom half of the block allows you to increase or decrease the value by dragging left or right, and the movements you make translate to relatively smaller value changes, so you can be relatively precise. Clicking and dragging in the top half of the block allows you to select a specific value by dragging, and the position of the cursor translates directly to the position of that value on the bar.
Actually, in Gimp 2.10.4 it now for me even changes the shape of the cursor: lower half: ↔ (left-right arrows) upper half: ↑ (up-arrow) so it seems they fixed the discoverability :)
Agreed. It's hard to imagine a scenario when you open a file in GIMP and don't want the tools. While there may be some such scenarios, it's hard to believe that it's a common case.
> when I open the toolbox it is (sometimes) a vertical line of buttons (single column) instead of 5 columns that I begged it countless times to be
Oh, yeah. Having the toolbox form factor changing and the tool buttons moving around (seemingly at random) is by far the most annoying part of GIMP for me. I don't actually much care what layout is chosen; I just want it to stay the same.
Where do I start?
And that is even without mentioning the whole Save / Export fiasco.Note that I love Gimp and use it often, but UX is not its strong point.