MK11 used UE3, not UE4. and they did so cause they know UE4 is resource intensive and for a game that is primarily intended for higher hardware like PS4 and X1, they had to make their own tailor made UE3 so that the port to Switch is not a big noticable difference in framerate/resolution.
ROTN team can't afford to tinker with UE3. the project for years been focused on primarily PS4, X1 and PC as the base hardware standards and the enegine they are using is UE4.
and Switch port would naturally have to be scaled down.
its really not easy to port a game like ROTN from PS4/X1/PC to Switch and still maintain 60 fps.
if people think its easy they can try themselves when PC gets it, then they can reverse engineer the game and try to port it on to Switch themselves using UE4 and have it at 60 fps on Switch. ha, and they call the devs lazy/incompetent. the critics can't even develop a videogame themselves at even COTM's level.
now Samurai Shodown is developed also for the Switch from the start, but look at the LARGE delay for that version compared to PS4 and X1, which are getting it in June.
more time and work would have to be done for a Bloodstained ROTN Switch version, and I would say most backers that play on other platforms, don't want to wait beyond this summer just so the Switch version gets 60 fps.
its really bad taste and foolishness for those whiners out there to pick Switch as their platform for Bloodstained, when PS4, X1 and PC are clearly better and more optimal. and Switch fanatics are suddenly shocked its capped at 30 fps? how naive of those communities.
anyone that even has a basic idea of hardware differences, could have seen this coming for Switch version. Switch is fortunate to be getting the game at all.
it kinda reminds me when Vita fanatics were shocked that they werent getting FInal Fantasy Type 0 HD, a remaster of a PSP game. they think Vita could run it, but even PS3 can't run it at a standard consistent framerate, so Square Enix skipped the platforms where the game would underperform below the standards.
FF Type 0 HD utilizes some XV tech. which enters PS4 generation minimum hardware requirements, at least part of it uses graphics, effects and technology beyond the Vita/PS3 generation, so even without looking like a AAA PS4 game ,it is more hardware demanding than what Vita/PS3 can handle.
also again, Bloodstained ROTN devs are practically an indie team that had some growing pains and setbacks due to another team that was at first doing the game ineffeciently, so they had to reorganize and get people that utilize more of UE4 capabilities. they are fortunate making the game look and play this good at all. and these graphics, animations and gameplay are leagues better than Dracula X Chronicles.