there's no need to mandate it, but the EU could spend a few ebucks on consumer appliances interoperability testing, and simply shaming those that suck. (or at least put out a statement about the problem, which could be simply lack of incentives for cooperation on solving the issues. or maybe too much backward compatibility preventing the whole ecosystem to move to more robust BT standards, etc.)

for example just a few days (week) ago there was a thread about how Logitech wireless stuff and wireless headphones interfere.

sure, it's hard to point to a singular root cause (Logitech emits too much, or headphones are ill-designed and BT is simply not the right tool for this because this or that)

but there are clear software (firmware, drivers, kernel) failures, that stem from simply releasing absolute garbage. (and every layer just coding for the happy path.)