Methinks there be a major disconnect between what I see RTT as and what others see RTT as.
RTT was initially developed as a way of helping me out on my own commute. The entire feature set that underpins is essentially driven by what
I want as a traveller on the network. If I do something on the way that's quite helpful to further my goals in achieving what I ideally want - then it'll happen. The entire feature base is largely driven by my own desires to reduce pain on my own travels! The commercial imperatives by and large come second to that.
The fact that there is a committed set of enthusiast users around for RTT is both a blessing and a curse: blessing because we can find errors much more quickly than we otherwise would, curse because enthusiasts are very much a vocal minority when it comes to new feature requests.
KYT only really came about because I was getting quite frustrated with my frequent trips on the Highland Main Line in 2018/2019 and 170s only intermittently having sockets. Existing information systems only went to the degree of listing the number of coaches - but that didn't solve my problem of the 170s not having sockets on quite a long journey. It had long been said that the ability to do numbers were for the benefit purely of spotters and that it was commercially sensitive. KYT demolished the former part of the argument, and the fact that GBRf were happy to release allocations demolished the latter part in a way that I never expected realistically possible. Right time, right place, right people.
I find it interesting how much the opinion of everyone on this thread has changed, to be honest. When I posted the user-added idea, almost everyone was for it. Now the second that Tom said he thought it wasn’t a good idea everyone is against it. I’ve made a note of that

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I've made statements before that I'm not in favour of user or crowd sourced allocations - your suggestion wasn't new in any case and we've been having requests along those lines for the last 3 years ever since the first set dropped.
I acknowledge that it's a nice to have for some but it's completely outwith my general direction for RTT and other sites are better suited for answering the more enthusiast questions. I don't think RTT can be (or ever will be while under my control) a one stop shop for all the needs of the general public and enthusiasts.