Direct vs kernel 'learn all'

[Chris Webb]

Very happy long-term bird user here - thanks for a great routing daemon!

In the changelog for 2.14, I noticed

   https://gitlab.nic.cz/labs/bird/-/commit/e83beb70bd14923cece5b35411606ade6fb8fbee

which introduces 'learn all' for the kernel protocol, allowing device  
routes to be imported as with the direct protocol.

Is there any reason/situation to prefer either the direct protocol or  
'learn all' on the v4/v6 kernel protocol?

If not, is your intention that direct be retired in favour of kernel  
'learn all' eventually?

Many thanks,

Chris.