Why YSK: Searching topcs on reddit was simple matter of entering desired term and prepending or appending keyword reddit.
With lemmy's decentralised structure finding particular topic without knowing to which, or rather if even there is community dealing with such topic(s) can be a headache inducing hurdle. So appending simple:
Fwiw I don't think they were complaining. I found it useful to clarify that it's not a complete search.
I frequently append "Reddit" to searches for more informative results. I can imagine that in the future it would be great do perform simalr searches covering all of the fediverse