They've discovered some bronze boxes, sealed with beeswax that are over 1000-years old with their contents perfectly dry and intact...wax makes a reliable seal when used as intended!
The hassle is, you need to replace it anytime you remove the toilet as reforming it is messy, and not always reliable. If you like to remove the toilet to repaint, change the wall paper, etc., on a regular basis, or initially during construction, a waxless seal makes sense as it saves time. IT does not save money, as you can probably buy numerous wax rings for the price of one waxless one, but time is money, too.
Terry's practice when one is not thick enough, is to use one with a funnel, and one without...the one with the funnel helps to align the second one, and helps reinforce the assembly so it's harder to blow out if you aggressively ever plunge the toilet. FWIW, most people may never need to remove a toilet except to replace it during a remodel. Wax has its place, and, there's less plastic to deal with.