I think there is the basis of a good idea here. I'm just not sure how it would work. A spreadsheet listing all the current and recently available makes and models with ticks for features would certainly be very handy and reduce the number of questions that have obviously been asked before and which might take much mining otherwise to pull up. Including older models, given the second hand market, would be useful as well.
There is a huge amount of useful information already in the old threads, but it isn't always very quick to wade through and search strings don't always pull up all the relevant posts.
It sounds like a job for someone with a bit of spare time, collating all the technical information, publishing it to get comments, then adding those in, to provide a download. To be worthwhile, it would also need updating as new models come out.
In view of the time involved, there would really be a cost element. Maybe sponsorship (probably NOT from someone selling routers (!) but maybe a router bit manufacturer, with an advert heading the spreadsheet, to encourage someone to take the task on