The BB58 is, in my opinion, a nearly perfect watch. T-fit would make it perfect. I put a Steel Reef extension link on mine, though, because although the BB54 bracelet does fit it's a bit too pricey to buy just to add T-fit to the BB58.
I am a person who likes to wear my watches fitted, not loose, so a tool-less quick adjust is a necessity for a metal bracelet, and the Steel Reef link makes it the same as my Rolex bracelets, with 5mm of easy extension. Prior to getting the Steel Reef I only wore the BB58 on straps, but I'm happy to have it back on bracelets, which I usually prefer.
It's likely that Tudor will upgrade the bracelet on the BB58 black and blue models, and it would make sense for them to do that this year since the BB54, BB Pro, Metas BB41, Ranger, and even the BB31/36/39/41 series all have it. The BB58 and BB GMT still need the upgrade. But you never can be sure when it will happen, so if you want the watch now, then buy it! If you're happy to wait then it won't be long before Watches and Wonders.