Why does KRunner start loading plugins only after typing for the first time?

[Fusion Future]

When I was debugging WebshortcutRunner::WebshortcutRunner, I noticed
that KPluginFactory::instantiatePlugin (or other functions that load
plugins) was called after typing for the first time, which makes
KRunner not able to instantly take input.

Is there any reason not to preload plugins?

Thanks in advance.