Says everything you need to know about the TOCs. Frankly GWR should have grown a pair and told DfT where to go. I’ll bet the same seats will be used in the Hull and TPE 802s as well - no doubt with bleating about “Hitachi said” and “cost”.
You seem to be an expert in seating, thus, would you care to tell the audience just exactly what seats are on the market place for 'intercity/inter-regional' layouts?
Yes ladies and gentlemen, two. The FISA Leap and Compin-Fainsa Sophia. Grammer, as far as I am aware do not have a current compliant seat (note Kiel should soon). (Yes, there are a few more seats for commuting - eg Quantum).
So it is not the TOCs or the DfT to blame. It is squarely at the seat manufactures having utterly no interest to put more designs through regulation, as the ROSCOs are happy with the Compin-Fainsa 'fits' all approach, = £££ saved.
No speculation about the TPE 802/2. They have the Compin-Fainsa Sophia, same as any Hitachi AT-300. And seeing as TPE have specified cloth lining rather than cut-pile, I suspect they shall be as firm as the DCA Design groups take on the IEP specification. I suspect Hull Trains shall also be cloth, as it is the fashion in design houses. The best seat covering, shall be on LNER where they are using a mix of loop- and cut- pile.
I suggest you re-angle your distain at the RSSB, ORR and ROSCOs as nowt to do with the TOCs. Until those outfits become more flexible to pushing for new regulation or encouraging more seat manufactures to the well know British pedantic level of regulation...all I can say is good luck!
The reality is, firm seat are here to stay. And if you are proposing to change regulation, you would be a brave gentleman/lady.