Well first off, do you actually need all that? How formal are these meetings?

Ours are pretty informal, we (unfortunately) use MS Teams which has an agenda & notes section; people are asked to fill in the agenda if they have any points (which is frustrating because getting there isn't easy or obvious), people can write down notes and action points during the meeting (it's a shared and collaborative effort).

You can assign tasks to people's todo lists though, but of course the problem is fragmentation; everyone has their own todo lists, there's Jira for work items, etc.

It sounds more formal than it should be. In my mind, it's more about easier searching and retracing steps and decisions. The only really formal thing in there is the list of TODOs and the DECISIONS. The first ones because obviously you need people to do them, and it's easier if they are automatically on a list of theirs and not forgotten. The DECISIONS are important because in retrospect somebody always will want to know the when/how/who/why around them.

But you could be right, this might not be the unifying tool for everything but more like number 29 that has never replace the previous 28...