I don’t think the intention is to have just a single theme, going forward. It is more of a time and resources issue for Sales Agility, with the major focus being on other parts of the software. The mistake was simply to have an independent designer create Suite P, without investigation into how and where SuiteCRM is deployed. (That’s why you have UI/UX people).
Regardless, as you can see, some of us have already created variations of Suite P, to suit our own needs.
When it comes to themes, in practical use I don’t think there should be a fixed selection. Like a user’s PC desktop, it should be made almost infinite … along the lines of the color selection screens available in the Suite 7/Suite R themes, but expanded to add font sizes, padding (spacing), etc.
“Themes” are not just about pretty colors. In different parts of the world, certain colors have much significance … and superstition! As an example, reds tend to be popular in parts of Asia, but blues are a no-no, as they are funereal colors.
I actually think “themes” should be configurable and “savable” as different variations, which are then selected when a User logs into SuiteCRM. By doing this, you just select the layout that is best-optimized for whatever device you are using at the time … your PC, pad, smartphone, etc.