If it had all that, why did this 'mech die out? Just to make way for the OmniMech?
I feel like that's just something we're going to have to accept with these designs (aside from the odd star league or intermediate tech system). The same way we just had to accept the early mechs in ED Golden Century went the way of the dodo even when they were actually pretty great in some cases.
Clan tech peaked early, and didn't go anywhere for a long time afterward, so there's not a lot of room for older designs to just be inferior technologically, and it'd look weird if they were just badly designed.
looks like
gauss
x2 er large
x3 med pulse (the slider looks like you can scroll down a bit)
?
I'm betting the gauss is an "improved" model, just because some text was cut off.