I agree with that part of the map and find that E KS and E OK are worlds apart. I avoid the latter like the plague in all but the most desperate of times, whereas there are only a couple isolated pockets in KS that are worth that kind of avoidance. Roads can be an issue in the Flint Hills, for sure, but it's more like a toned down Cherry Co. situation: you'll still see the tornado, it just might be from 10 miles away. The two legit trouble spots I've run into are (1) Manhattan-Junction City northward for about 20 miles, and (2) +/- 20 miles either side of I-70 from Topeka to KC. Even then, those just barely rise to the level of how awful the average spot in E OK is!
Well in that case, I feel stupid for having avoided E KS for all these years! I don't think I missed any significant events by doing so, except maybe Lawrence in 2019, but I stayed away from that more because of the metro area. I will definitely consider E KS a part of my range going forward.
I guess my bias against E KS is a function of my very first years in chasing, when I was with one of the original tour groups, Marty Feely's Whirlwind Tours, in 1996, 1997 and 1998. He always had a rule of thumb of staying west of I-35. My impressions of E KS were probably also skewed by how it becomes less favorable just east of Wichita (see stripe of orange on the map), so in my mind that always marked my eastern limit. I guess I never really had much occasion to venture there on any of my chase vacations, nothing was ever compelling enough (or there was something better further west).
To be honest, there are a number of areas that kind of suck in W KS too, such as up around I-70 near Quinter, areas around Scott City, Leoti, Jetmore, etc. Paved roads can be 10+ miles apart up that way, leaving huge areas with no roads to get to a NE or SE moving supercell... Not sure whether the map differentiates between paved and dirt roads, there are plenty of dirt roads in the area mentioned but many are not very good quality. Especially in 2021, on a few chase days in the area they were wet and muddy from previous days' storms.