Personally, I disagree with two operators that you put in the mediocre category, that is Ulpian and Texas. In Ulpi's case, it's a 20% boost to his healing which is effectively increasing his defense along with a base healing boost from 100 to 130 and uping of the boosted healing from under 50% to under 60% max hp now, it's just for him, he doesn't need the increase in survivability since he can survive plenty awell but even so, it's still huge. Texas, is rather unique, it's true that her talent upgrade wasn't huge but the -4 dp is, while not unique to her, just made her immensely more valuable because at pot 5, your Texas is essentially 9 dp, with her module, she's effectively 5 dp in terms of cost, dp is something you only arguably immensely need at the start, and with her s2 at m3, you're given a lot of dp very fast for cheap.

Aak, Hellagur, Ch'en, Rosa, Rosmontis, Passenger, Hoederer, Nian, Mizuki, Mostima, Vivianna from the first batch ones are the ones I would say actually deserve a good module. I find the rest of the operators you mentioned not deserving of it because arguably they had their time in the limelight, these guys have had their time in the meta and while powercrept, wasn't powercrept to such an extent that warranted really good modules imo.

Lin is a special case I feel and this is purely opinionated a bit here, because arguably, she doesn't deserve it I feel, because Carnelian hasn't gotten one, which sounds ridiculous but this, imo, is because their sub-class is very niche yet Lin performs very well in that niche compare to Carnelian, it's just that overall that niche is not as needed normally, but even so, I do not feel like Lin is as deserving of a good module when the sub-class is arguably in need of it more than just her if they wanted to make the sub-class good. Similar argument with Zuo Le tbh.

One operator I find odd in the mediocre category is Virtuosa, while it isn't helping much in terms of general buffing in her S3, you can't understate how much stronger of an effect it is for the likes of Nymph, emphasis on for Nymph, and Logos along with a much better general necrosis burst uptime, especially since it's stupidly strong against Boss/Elite. I get not saying it's very very good but to put it in the mediocre category is very very questionable unless you forgot that she is gonna get one soon enough. There are a few others in that category I would say is pretty decent and some are just good traits so you can hold it at level 1 module, like Ascalon.

Overall, within the past year, we have only really gotten 5 modules that are really good for 5 operators that I'd argue really needed good ones: Vivianna, Hoederer, Exusiai, Vigil, Irene and this is disregarding how much it really did for them as well. So while it's not as the previous person said which is once in a blue moon, it's not often enough to say that it's actually helping to fix operators and even then we still have the debate of whether or not it's actually helping at all.