It's populism. Empty, vacuous, populism. An MOT can be had for well under £50 a year. That saving would be a drop in the ocean compared to the recent increases in the cost of living. Our grocery bill has gone up by more than the cost of an MOT in the last month alone! Of course, people will argue that it's not just the cost of the MOT that will be saved, but the cost of the work too. Yet, hang on! If you're saving on the cost of work, doesn't that mean you're driving something that would have needed work to pass an MOT?!
Of course, there are the blatant rip-offs that people hear tales of, at certain "large chain" retail outlets, but that's a separate issue. There is an appeals system for such places, whether it's every year or every other year.
I could, however, support a tougher test every other year. So you get a test like we have now, one year, and an "enhanced" test the next, where they check things (particularly emissions) in a bit more detail. The current MOT emissions test is, IMO, a joke at present, for more modern cars.