I do check their profile when I receive a DM from someone I don't know. If only, to get an idea who is trying to reach me, what I can expect, and how I should reply. My profile tells people where I'm from and how old I'm, stuff like that. So, anyone checking it will at least understand why my English can be lacking, and why I may not be that interested in stuff or questions younger people consider important. I also share my blog url in that profile but so far I don't think anyone ever contacted me there coming from Lemmy ;)
I don't mind a blank profile, but it won't help me feel... connected to the person. So, my reply may not be as complete or personal as it could have been.
+1.