See nvaccess/nvda#505 (comment) and further.

Basically, some users want the capsign while the current tables (de-g0-core.uti) have it commented out.

Another option is to add a translation flag to suppress capitals. But the problem is that the rules for what should and should not be suppressed aren't standardized. For example, consecutive capitals are not commented out in the German tables. So this translation flag probably needs some extra opcode too. It seems easier and more elegant to deal with caps transformations in pre-translation.

Disclaimer: I don't actually read German braille, but can empathize with the issue.