Have you ever seen the stainless rings fail? Just qurious as I believe they can still rust just takes alot more but if they get constantly wet I could see it happen. It's more that I really just don't trust that tiny lip that holds it to the pvc.
I understand why you're worried but no, I have never seen the stainless flanges rust at all. The "tiny lip" that holds the plastic flange up in the stainless ring isn't really tiny. Also, it's only job is to hold the wax to the toilet, it shouldn't have any weight on it. Since the stainless flange never fails the toilet won't rock in such a way that the pipe is pulled.....
im with you,I like the plastic flanges and toilet is installed properly there are no problems
Now if you use crappy fasteners or the floor rots out, that's another issue altogether. Large tapcons make great wood screws.
I have seen to many all plastic flanges fail to even think about installing one.