Cost certainly.
-Up front cost is high. A new 372xp x-torq or 576xp might be cheaper, I'll bet, once we see pricing state-side. But especially compared with a used 372xp or 576xp, it's a lot to outlay.
-Dealer support for software updates and any electronic hang-ups, compared to independent mechanics or a DIY, will be higher.
-if the bigger bearings are proprietary and not 6203 standard I can see higher cost of maintenance parts.
It's more complex.
With my old 372xp it was four bolts to remove the cylinder from the case, and the whole carb and muffler came off too. Plenty of room to get eyeballs and fingers around things and work out a fuel line replacement or assess a torn rubber boot. But my 562xp is like a puzzle box. You have to take half the saw apart, in a specific order, to get to a point you can see what's what, or change a part out. That means there's more of a learning curve for DIY fixes, more headache when it's occasional stuff you don't remember how to do, or more cost to a shop/mechanic who has to spend more time on the saw.
Less room for improvement.
Because of all the electronic nannies and EPA limits, there is less ability to do the old tricks for more power. That can be a good thing, since out of the box the saw will likely be very strong. But with the CAD design, simulations, and engineering going into these new saws, they aren't even leaving as much power behind on the table when they make it the way they do. With an older 372xp you can do a farmer john muff mod, do a base gasket delete, shave the key on the flywheel for ignition advance, or open up the intake and exhaust with a dremel, or do a full blown base/squish cut and port adjustment. All to chase 10-25% more power. That extra gain beyond stock can be pretty fun to chase and satisfying to find. I will bet these newer saws maybe gain 5-10%, even once builders figure them out and have their recipes dialed in. That kind of takes some fun out, and less potential to tweak/change things.
I'm still excited about trying one of these new saws. I think it's cool that they have their power-to-weight ratio chart to show that this new saw makes more power than the old 372xp. But I'd love to see how a ported 372xp compares to the 572xp.
Mostly I just get tickled that auto-tune does the job of adjusting the mix on the fly better than I can/would.