Can no longer disable "size changes with spatium" in text styles
Reading around the forums I can see that this option was removed deliberately as part of the wider effort to make text styles simpler. However, I think removing this particular option was a step too far.
I use the "text size changes with spatium" feature (or rather the ability to turn it off) to get the titles and copyright text on the cover pages of OpenScore editions to be the same size in each edition regardless of the stave size in the score. Of course I can still achieve that effect by manually adjusting font sizes until the text looks the same size in each score, but that is an awful lot of work to achieve something that used to be done automatically.
To make matters worse, even if I did go through all the scores and set the size of each item of text manually to make them look the same, if the score is edited later and the spatium changes (e.g. to ensure page breaks stay in the same places) then all of the text sizes would have to be manually redone. If they were not redone then linebreaks would be in the wrong places.
There are many other uses for this feature besides cover pages, such as adding libretti and stage directions to operas, adding a foreword or dedication, or adding any other piece of text that goes with the music rather than being part of the music. The removal of the "size changes with spatium" feature renders all of these use-cases infeasible.
In fact, I can tell that the other developers agree that this is a useful feature - because it is still there for certain text styles (e.g. Title, Composer and Lyricist). These styles do not scale with the stave size even though all the other styles do.
It's true that removing the "text size changes with spatium" feature has made the UI simpler (one checkbox simpler) but it has not made the internal implementation any simpler since the code to prevent text from scaling clearly still exists. In fact, it has made the internal implementation more complicated since now certain text styles have been special-cased whereas all text styles were treated equally before.
I would very much like to see this highly useful feature restored, especially given that it still exists internally.
If you want to make the UI simpler, here are two alternative ways to do it:
Only show the "text size changes with spatium" option in the advanced workspace (hide it in the basic workspace).
Change the wording of the option to "font size in spatium units". If it was enabled then sizes would be set like "10 sp", which would obviously scale with the music. If it was disabled then the size would become "10 pt", and this obviously would not scale with the music.