Profile of Katitof

I like that con buff here, it might be what's needed for them to stand up on their own legs in late game.

We might change that but, it should be noted you are also waiting for T4 to activate during that time.

Just replace SVTs with con PTRS package and call it a day.
Only squad in game they really do help are sweeper CEs.
PPSH penals are too squishy and not mobile enough to actually engage with that potential DPS and yeah, timing or not, SVTs overlap with that con buff, even if SVTs arrive earlier and are easier to use(due to no cover required for full dps).

As much as I love SVTs, the way they are now, with the drop(implying it was considered and at the end intended to share it with allies in team games for whom they do absolutely nothing) feels really forced, given the fact that just 2 weakest units in game actually benefit from it in any way.

If stock conscripts spam becomes a viable tactic as it once was, there will be little reason to built any other unit.

I disagree completely.
Conscripts can't handle lights, so you already have the need for penals/guards or T2.
Cons won't certainly handle new, early PGs, so you have a need for penals/guards/shocks.
Cons will quickly start falling behind volks in early and mid game once StGs appear, which means penals/maxims/elites are needed again.

And the most important thing you really seem to forget about is the fact that this con upgrade is T4 and cons start falling behind as soon as 5th minute of the game due to appearing opposing elites and weapon upgrades.

Early game con spam is going to be as easily counterable as it is now. 4 cons might see re appearance without the need of ppsh doctrine, but more then that at you'll be shooting yourself at foot again, hell if 7th man upgrade isn't scaling them sufficiently enough, 4 cons already might be a bad idea.

The aim of diversity changes as the one conscripts is should be to create room for all units to be used. Else you simply replacing one spam with another maxims->Penals

And that is precisely why cons need to be made viable at end game as well.
So we do NOT HAVE to spam one single type of unit to carry the weight of mainline alone.

Cons being cheaper then penals and maxims specifically allow for diversity as now you have a bit of extra resources to put in other options without the absolute need to resort to spam that other options exclusively as it was the case with penals, maxims and guards up until this point in time.

Again that theory is simply false, since adding a 7th entity also increases durability. If they aim was to increase damage they would a weapon upgrade.

Yes, people have suggested weapon upgrade for years now.
Firstly relic and now modders do literally everything in their power to avoid it, because reasons.
7th man was implemented and guess what?
Modders themselves are now discussing possibility of giving that upgrade an additional DPS boost, because clearly and empirically proven, both over last years and in this very mod, durability alone without any bite gets them nowhere.
Now, they don't need LMG42 level of DPS increase, but they most certainly need DPS scaling more then durability scaling, especially in late game, where its NOT small arms that decimate them, but prolonged engagements with a lot of explody stuff involved.

If one increase DPS one simply run the risk of bring back conscript spam.

I'll share a little secret with you:

ANY change that will make cons a viable choice will bring back con spam. There are MULTIPLE commanders who are DEDICATED to spamming cons. Con spam is most certainly very intended since day 1.

Now, how exactly is that a bad thing again?
Its a faction that IS DESIGNED to SPAM one type of infantry and then supplement it with what's needed later.
You know what happened when con spam was killed?
Maxim spam happened.
You know what happened when maxim spam was killed?
Guard spam happened.
You know what happened when guards were briefly killed?
Maxim spam returned.
You know what happened when maxim was again killed?
Penal spam happened.

The faction is MADE to spam select type of infantry, just like OKW is meant to spam volks.

So how would you change conscripts to make them worth using and still keep them unique?

As already suggested earlier.
7th man to help them vet and last and RoF buff(either conditional or general) to give them a bit more ooomph to not be just a slightly more durable vet piniata.

It gives them green cover bonus which reduce chance of instantly loose model and give time to make some damage. I wouldn't say it's a bad idea but don't think it would solve the entire conscript problem.

It was nerfed to yellow cover years ago.

And if you're in position where it would be even semi optimal to use it, you already lost a model.