Odd, I have run a TBH and a Lang side by side, And I much preferred working my top bar. I can usually get away working my top bars without gloves and not get stung than I can with a lang. First time I opened up the lang I wasnt wearing gloves and I got stung on the hand about a minute or two in. I looked through my strong TBH a couple days ago with nothing more than a veil and short sleeve shirt, they didnt seem to care too much till I got to the front of the hive, even then.
In fact, up until yesterday The only times I've been stung was in fooling around with a lang.
And the only "problems" I can see you having with TBH that you wouldnt get in langs is.... well, I cant really. If you go foundationless, you still risk breaking comb, and cross combing, and "extra" drone. The only point you have is with honey harvest, however I STILL prefer my TBH in that regard as I'd rather have fresh wax than several year old wax that has soaked in all sorts of stuff I'd much rather not have near my hives in the first place.
In regards to swarming, thats why we do splits, and if you dont want more hives, sell the splits. This desire for a continuous brood cycle is not good for the bees, but it is great for varroa, and then by the time summer hits, you wonder why your hives are crashing. In fact, I think I'll take after Sam Comfort in the regard and when it comes time to do some splits, I'll package em for a couple days and then house them in a waiting hive.
About the only thing you can do with a lang that cant do with a TBH is be a bit rougher than you should, but this doesnt teach you anything. You shouldnt manhandle bees in the first place.