Should the Yak-130 have air-to-air missiles?

You mean even “further br raise”. Either way it should stay same. As @Cloudzy26160 said, devs can add another variant with aam, flares and agm at different br.

Yak-130 with R-73 would likely be 11.7/12.0.

depends on if it gets flares or not imo

It would still end up at 11.0+. Even without CMs.

it wont be higher than 10.3/ 10.7 where all aspect missiles start popping up without CMs

Dont need to go for all aspect then you start to deal with more advanced rear aspect, like R-60 (and that it is without even mentioned ground battles)

It would be at most 11.3. It’s inferior to Su 39 in a lot of ways. It would be fine at 11.3.

Just wait for a future variant with R-73s & flares.

Wish they add a 10.3/10.7 tv munition platform for ussr which isn’t locked behind a paywall like su25bm

" Should the Yak-130 have air-to-air missiles?"

Yes and it should also p1ss off from 9.0.
I mean, cmon…who’s idea was to put it in 9.0 in simulator??