I recently had a very frustrating experience where I was trying to reconfigure
kwallet after installation, and the changes I was making in kwalletmanager were
not affecting the wallet that stored most of my passwords (I didn't realise
there are kde4 and kde5 versions of the wallets that are used at the same
time!).

Since most of the default applications on a Plasma 5 installation store their
information in the kde5 wallet, I think kwalletmanager5 should be installed by
default instead of kwalletmanager.

See also:
https://forums.opensuse.org/showthread.php/513456-Default-installation-with-Plasma-5-should-have-kwalletmanager5-installed-instead-of-kwalletmanager