Or does anyone know what in 2.0 vanilla (non-DLC) can/does replace it? I've seen mentions of this mod being made obsolete, but I don't see where in vanilla it shows the same info.

I would like to update it for 2.0 yes, I'm just wondering how to deal with the multiple surfaces of the DLC (I assume most people will be playing with the DLC) and the reverse-recipes that the DLC brings. So it feels like it might need a UI overhaul...

I have not seen anywhere that this mod has been made obsolete, where did you read that?

Hmm, there were a couple posts on Reddit claiming lists of obsolete mods, and I was pretty sure this was on one of those lists, but now I can't find it anymore, so I might have misread something.

Also do note that there's also another mod with a very similar name. I think it's called "What's missing" (this is called "What is Missing")

feel free to use my fork in the meantime

@kuxynator Feel free to make a pull request on my GitHub repository.

@zomis git would be overwhelmed by this. i have made more than just quick and dirty changes for compatibility ;-)
I have restructures the files, refactored the code and added (most) complete EmmyLua documentation for more clarify.
But as soon I have a stable state, you are welcome to copy the complete code back, if you like it.
At present a make a rework of the async part to be save safe, because there are currently errors on save.

I miss this mod so much.
Game is unplayable for me with Py as too much to track unfulfilled requests manually.
I wondered if it's possible to do this with combinators.
To read inventories is easy, but to read requests is not so. I can use constant combinator and set value of request as soon as I placed request chest, but if I have tens of requesters this value should be summed up, and I don't know how to read summed request signal.
Arithmetic Combinator could calculate the difference between requested items and available stock.
Decider combinator could filter negative values.
And Combinator display could show shortages.

The problem is it's beyond my competence to set this up.

I just realised that roboports can send this signal of unfulfilled requests.
Just connect decider combinator with the wire to roboport, then open roboport and select "Read Logistic Network Requests".
Now if you select decider combinator, all the unfulfilled requests are shown there.

@Varijotas who are you talking to and what does this have to do with the update to 2.0?

I'm talking to you guys. @zomis said he is not sure yet how to make this mod compatible to 2.0
This functionality to show unfulfilled requests is already in the game, so mod author could just make a new gui for that.

Personally, that's enough for me as it is my fork