I do love this - another myth busted. In the late 90s/early 2000s we were told two things - no more regular gangways and no more big overhead racks. Yet many of the EMUs and DMUs ordered in the last 5 years have had both gangways and larger racks and continue to do so.
So there's basically no excuse for the useless coat-racks on Turbostars, Electrostars and 175/180, then. Thought not
The real ride quality benchmark for the BR era has to be the Class 158, which still rides better than most other stock on the network (221s and possibly 800s excepted). No BR era LHCS rode particularly well - Mk1s, well, are Mk1s, Mk2s had a characteristic vertical bounce over the bogies, Mk3s a side to side sway due to inadequate damping, and Mk4s, well, the least said about the appalling ride quality of those the better, the last time I had one of those at 125mph one particular bit of the ECML felt like we had come off and were bouncing along the ballast such was the vibration.