...Albeit unintentionally, as TIlly's looks are played exclusively for laughs - it's a plot point that she's supposed to have bad looks and worse social skills.
Of course, now that Tilly has switched roles to MU eye candy, the usage may change. Again possibly unintentionally, although I would gather the whole Captain Killy thing has been specifically designed to change the character and give her new self-assurance and whatnot. (And, no doubt, the initial goofiness was also designed as maximal contrast for this planned-for change.)
While this is what is really going on in the show, none of this has anything to do with any of the issues below:
1) Whether fans find Tilly/Wiseman attractive or not (sign me in the former camp, at any rate)
2) Whether T/W is attractive or not, in some metric or another
3) Whether T/W is a role model or not, for some agenda or another, intended or not
It is likely to have something to do with these, though:
4) Whether T/W represents a trend or an exception-emphasizes-the-rule case
5) Whether DSC will do more of the sort with other characters, that is, deviate from Hollywood rules of aesthetics on body, face, personality, teeth or whatever
6) Whether W gets typecast
Timo Saloniemi
Yeah, I think they were going for *librarian swooshes down staid bun hair and pulls off glasses* ‘my god miss jones you’re beautiful’ with the Captain Killy, but I think it got tangled along the way with ‘evil is sexy’ ‘sexy is evil’ and the ‘it’s whats on the inside that counts’ is getting lost, because we Still don’t know what’s on the inside, except possibly some unrevealed till now domniatrix tendencies and a hint of sadist. It’s a wonder we aren’t now wondering if Tilly was MU Tilly all along. Character needs to be handled better.