The shuttlebay appeared in a lot more than 2 episodes of VoyagerYes, exatly these two.

The windows in Janeway's ready room are curved (they're the old Ten Forward ones, flipped), but on the model they're flat.Whenever something happens with the ship - shuttles launched, torpedos fired, warp cores ejected, ship docking with other stations, even only people standing at windows - everytime the outside matched with the inside!
Discovery isn't well produced? Despite all backstage turmoil, the show is a very slick production.That's a fucking achievement. Proven by the fact that VOY and ENT are the only two shows that are able to pull that off consistently. And TOS, TNG and DS9 are damn well produced shows as well.
Every window on the Enteprise-D was the same, even though they'd have been radically different depending what deck you were supposed to be on. Picard's ready room window? Doesn't exist and it's in almost every episode. Ten Forward? Scaled up x2.They're still only a tv shows though, so flubs will always happen. But I think it's a hard stretch to put the damn details of the blueprints against it - TNG doesn't have a giant rubber duck on it's decks, and VOY has, per canon, only one warp core. As far as VOY's shuttlebay goes - this is an issue. The shuttlebay works for all standard-sized shuttles seen in the first four(!) seasons. Only when they added the Delta Flyer it became an isse. But hell - that's 5 seasons in, and starship sizes have always been inconsistent, and the alternative would have been no Delta Flyer at all, so I think they made the right choice there.
That's a far cry from having almost nothing match at all right from the beginning. Having no visible weapon launchers, no docking ports, and not even the same standard window shape as the damn sets.
And DS9 was designed to a specific scale, which was pre-ruined when someone demanded more windows be spammed on the central core with no rhyme or reason prior to filming. And then the relative sizes of it and whoever was docked were fudged to whatever looked good in the shot. Most awesomely, if you look closely you can see the docking pylon of DS9 goes through the Enterprise-D's warp nacelle

But it wasn't Discovery that did it so it's okay, right?

The model has spacial torpedo tubes and phase cannon ports, not photonic torpedo ones. And certainly none on the pod between the nacelles.And just btw - the NX-01 has specific tubes on the outside from where it launches it's weapons from. Every. Single. One. It has a lot of those - so maybe cou can say it launched them "from wherever the CGI team felt like". But it DOES have them.
As you said, they're all TV shows, and all they're trying to do is sell the illusion of being on a futuristic space ship or station. I wonder how many people actually noticed any of the flubs we're talking about? Star Trek Into Darkness showed us that hull panels can slide away wherever and expose any trash exhaust chutes, or photon torpedo launchers, or shuttlebay doors the plot needs.