There is too much information out for the problems with Sword and Sheild to anything but technical incompetence. The root of this technical incompetence is more than likely that GameFreak underestimated the work to reach the games full scope and continue to maintain a team that is too small for future Pokemon development (They were asked about the size of the development team twice and they gave a bunch of side answers). In order to believe your answer, we have to pretend that these obvious clues dont exist.

And that Yokai watch 4 and Digimon Cyber Slueth dont either.