Ok, I didn’t know about that previous discussion. If it has been once discussed to not add this functionality, then no point to do that again.
Just some additional thoughts:
1) shouldn’t `importaddress`, `importprivkey` and `importpubkey` output some warnings they are deprecated in favour of `importmulti`?
2) shouldn’t «Hint: use importmulti to import more than one private key» help message be altered to add information about additional functionality provided by `importmulti` in addition to importing multiple keys?
(that’s anyway different PR then, so I’m closing this)