is it just an ego thing that BCPL's don't want to be seen as 'mere' PPL's again?
Probably. BCPL(R) holders have had a blue licence for 24 years!
To be fair though, the BCPL was only created to allow the original PPL FI's to continue.
To be fair, in return, I think that many of those BCPL(R)s, who have several thousands of instructional hours, have served their 'apprenticeship' in lieu of CPL Theoretical Knowledge many times over!
So we are just restoring the status quo!
Could that be the Royal 'we'...?
At the end of the returning the BCPL to a PPL changes nothing in the privileges and will allow them to continue to work as Instructors. Whats wrong with that?
Nothing. But it hasn't answered my reasonable questions.
Edit: crossed with Whopity's useful answer. Thank you.