If this were a risk that we were correctly balancing against, you'd expect there would be some notable base rate of unreliable articles causing readers problems. But I never have this sort of problem. I'm never frustrated because I found something unreliable on Wikipedia, because I can always be skeptical of uncited information.
Elsewhere you asked for examples of damage done by the deletionists. So let me flip it around on you. What are example articles right now that you think are putting a large burden on the community that should be cut?
(As an aside, note the asymmetry: When too many hard-to-police articles are kept, there's ample examples to discuss. But when too many niche articles are deleted, I can't point to anything. I just say "huh, I guess my local taco stand doesn't have an article". And I can never know if it's because no one was interested to write one or because it wasn't notable enough to make the cut...or because the person who was interested enough to write it new it wouldn't make the cut.)