Hi David and welcome to the forum.
I can understand completely where you are coming from!
I am more of a consumer of Hornby International products, however, I did buy the centenary catalogue this year out of curiosity. If I compare the catalogue info regarding two very similar Hornby products, the OO scale BR Class 31 diesel and the HO Electrotren Renfe Class 321 diesel - both six axle designs of similar appearance and more importantly, similar models mechanically, the info presented to a potential customer is quite different.
In the 2017/18 Electrotren Catalogue I can instantly see that the 321 model has a 21pin DCC socket, metal chassis, flywheel, directional lighting, lit number boards, a rotating fan and a close coupling mechanism.
In the 2020 Hornby catalogue I can see the Class 31 has an 8pin DCC socket, five pole motor and lights (no idea what type) - I believe the Class 31 model may also have (or had) a rotating fan but cannot tell. Nor can I see if it has NEM pockets and a close coupling mechanism, something that is a must for me.
This is similar with coaches where I can see Electrotren Type 12000 have interior details and close coupling mechanisms where as there is no info forthcoming about the BR Mk3 SD coaches in the 2020 catalogue.
Unfortunately though, this forum appears seldom read by Hornby personnel and you would be best to email them directly with your suggestions. It would be good for the next catalogue and website to have much more detail.