Baloo is used as the main indexing engine and provides search for other apps like Dolphin.
But it fails to honor its promises, because it never finds searched files like how KFind does it.
The problem is that many core apps are heavily relying on it, so any bug related to search is dumped on Baloo.
And when you browse Baloo bugs, most of them are still opened because no valid fixes are possible due to how unstable and fragile Baloo is at the moment.
This situation is really urgent because correctly searching files is one of the main functions that a file manager should provide in any desktop.
So Plasma really need a new well-designed search engine that is solid and correct to satisfy and respond to Plasma desktop high adoption.