I think it depends on what type of athlete you’re dealing with. Some, like me, are big lactic acid producers and some are better at dealing with it. For those athletes that are lactic acid disabled, 250-210 work is great for the 200m. For those with the capacity to handle the 300s, then I would say there is some benefit for the 200m.
If you look at the 200 splits when running a 210, 250 and 300 you’ll notice you get further away from your goal 200m pace. When I first started running 250s, my 200m pace was in the 23.x. So this was not directly helping me run a 21.x 200m. While my 200 split in a 210 would be somewhere in the 22 area. Whereas if I ran 300s it would take me so long to get to a pace that would actually begin to transfer to my 200m (not saying running a blazing 200m in a 300m, but rather to get the energy system transfer). So it depends on the individual’s strengths as long as one distance intensifies the next one appropriately.