https://launchpad.net/ubuntu/+source/kubuntu-settings/1:18.04ubuntu6 added a Kubuntu Look & Feel package that implements a bunch of usability improvements that we agreed on, which is awesome!
However, one change snuck in that was not discussed and which I feel does not represent an improvement: disabling Baloo's full-content indexing by default. This change reduces the usefulness of KRunner and the Kicker Search. Full-content search is very useful for regular users, who can use it to find files if they remember something about the content even when they don't remember the file name. My whole family and extended circle of friends are non-engineer types who I would consider average users, and all of them make use of full-content indexing on their platform of choice to find files whose names they don't remember.
We should consider reverting this change and bringing back full-content indexing.