Honestly, I can see how tedious it can be. I use them, and the MUL, for when I try to create mech forces for game play. Before knowing of the MUL (just got back in to BT 2 years ago after a 22+ year absence)...I would hunt through endless PDF's, some of which the search function would not work, just to see if Mech A worked with Force B and so on.
So to the team that do these RAT's (and I'm sure I don't speak for myself)...although sometimes things may get missed...thank you very much for these tables. They are a MASSIVE help when doing force creation...especially for era specific time frames.