Yeah, pretty similar overall. Tho Tekton is also the underlying technology for Jenkins X. With Jenkins being such a common system in the CI/CD space, I think we'll see Tekton preferred going forward.

https://jenkins-x.io/

That...is an interesting dependency direction? Isn't Tekton MUCH newer? Are they developed by similar people?

Different groups of people working on the two projects, though we communicate pretty frequently.

Even the Argo team isn’t investing much effort into Argo workflows and Argo ci.

I'm not sure what gives that impression, but Argo Workflows is under heavy development and is used by several large organizations, including Intuit (Argo team is part of Intuit).