The 5D MK II had a big shortage, at the time, Canon or someone with the knowledge said 35,000 a month. They made several months worth before the announcement, those sold out and 35,000 is not a huge number when sales are good. I don't think they were setup for that many when the R6 came out, but they have probably accelerated to that or even more depending on the availability of components and factory space. With the 6 ft minimum spacing requirement for workers, they may have less space unless they have installed barriers. With generally slow sales, I'd expect that the spread out work stations further leaving the capacity for a lot of workers diminished. That might make it difficult to setup enough work station with the R6 being at a much higher production rate and competing for workers and space. Things can be changed, but not as quickly as you might think, additional specialized tools must be made if more work stations are added.