Geez Rhys and Rhett, don't sugarcoat it, tell us what you really think
I'm not a T206 guy either--once tried it (didn't inhale) and still have a handful of them, so I don't consider them poison or anything.
Actually, I believe T206s to be a great example of the "to each his own" doctrine. The cards are very attractive, IMO, and the great number of ways to collect them makes them a solid hobby choice. I no doubt will add some from time to time.
Still, the collector in me wants a bit more of a challenge. I consider T206s a set that (absent the big 3-4) is fully doable at any time at almost anyone's grade of choice, limited only by dollars. You can finish it pretty much whenever you want if your wallet allows, assuming you're not trying to snag only the scarcest backs. That is actually a positive for many collectors, who don't want to bog down on sets that have some cards so elusive it could take decades to finish. I get that.
Me, I like to chase sets that will take time to complete due to some level of scarcity, such that no matter what money I might have at a given time there are going to be cards that just aren't readily available to buy. I also don't see set completion as such an accomplishment that it must drive my collecting--I prefer to meander over time and fill in what I need the best I can. This is what is most attractive to me about type collecting, although I like chasing a set or three also to satisfy other hobby hungers.