First, and in relation to the OP ...
I apologize for ever mentioning the idea of leaving a connection unglued: I like to encourage people to think outside the box even if only for just long enough to decide to go right back inside it.
As to the two since-developed issues in this ridiculous banter that has been going on:
1) If plastic flanges indicate hack jobs, then many professional plumbers are mere hacks ... and we all know that is simply not the case. Personally, and as a DIYer who had a residential contractor's license 35 years ago in his 20s, I began using plastic flanges after I long ago grew tired of repairing rusted steel flanges, and I just learned about stainless flanges right here a few days ago. So then, you can rightly say I ignorantly used a plastic flange while not knowing about stainless ones, but you cannot rightly call me a hack for choosing plastic over plain steel.
2) Having left an impossible-to-leak connection unglued might now seem providential since it would hence be a breeze to replace my plastic flange with a stainless one! However, here is the reason I am not going to do that:
The toilet in question has a porcelain bowl on a plastic base (with about a 4" opening) that could be easily broken by overtightened bolts when the factory-provided foam gasket (no wax ring) eventually needs replacement (as I already know it will unless I "hack" two wax rings to make one large one and do away with the foam gasket altogether as I have already done in the back of my old bus). But: Not having any idea who in the future might find himself or herself in whichever way repairing the seal at the bottom of that expensive, special-application toilet, breaking a plastic flange is far preferable to breaking the base of that toilet, and leaving a non-glued joint today will eventually save somebody an awful lot of work and the expense of a new toilet if the bolts ever actually do get overtightened. Understand? In simpleer words: Keep calling me a hack and I will continue trying to help you out of your ignorance just like you have done for me concerning flanges.
As a final thought:
What would a professional plumber say to me if I called and asked about having a frost-free toilet installed in my new workshop?