Sadly Monzo have been clear so far [ (1) (2) ] that this is an intended move to a more self-help driven model.
As much as I would agree with the need for this, I have a feeling it’s not going to be coming back.
I’m hoping that in time the Self Help sections will have a significant overhaul, to be more intuitive and genuinely self service, but I think that’s the feautre we need to rally behind.
Until then I guess all we can do it’s make clear the ways to get to chat when needed.
Edit:
Which are: Search for “Contact Us”; Look at any transaction and press “Something Wrong” (though this may be changing); and I think you can also set up a deeplink shortcut to put you straight into chat.