> other owners say it runs fine without coolant, oil, etc
Um, no. Go ahead dump your oil and coolant, go drive your car, and report back how "fine" it did.
(No, please don't actually do this. Although here's a guy who did, for the clicks. The Honda did impressively well, but it wasn't "fine". https://www.youtube.com/watch?v=zyejT4VPzlE)
Coolant sure, my RSX has a radiator leak for the past 2 years.
Oil not so much.
My friend ran his 1995 Civic about 40 miles with no coolant in it. It warped the head and blew the head gasket. But I skimmed the head, put in a new gasket and got another 50k out of it before selling it. It didn't have a single problem the whole time I had it.