Haven't used it myself, but every person I know that tried Pulumi ended up going back to Terraform. From what I'm given to understand it is fine for small projects, but runs into problems at scale.

Personally I don't like the default SaaS/account required model in Pulumi. I have lots of things to dislike about Terraform, but that isn't one.

Mind you too with either tool you (or your devs) will still deal with Dockerfiles and Kubernetes manifests, you just would use Pulumi or Terraform or whatever to manage them.

Lastly: I have done the jump from Ansible to Terraform myself. If you have a large amount of machines to manage and want to minimize transition pains then don't just use vanilla Terraform, but instead go for a platform like env0 or Spacelift, or at least use Terragrunt to manage your plans.

You will never find a tool to manage everything. It's better to understand the pro and cons of each. The ability to use a real programming language is really the game changer of these new IaC tools (cdk / pulumi). You get a lot more momentum to involve others (devs) and share knowledges. If you don't find value in that, you have no reason to switch, you will lose the terraform massive ecosystem.

For me, it give me the real opportunity to progress on my coding skills in association with my ops/infra routine. It's a lot more fun than any hcl.

I was also curious about it a few years ago but I never used it in the end, not even to see what it's like.
But I'm afraid this community you posted on is pretty much dead so I wouldn't expect many answers :/