If you bought all of this pre-made from a vendor, you'd be tied to that vendor, subject to their pricing whims, support SLA, etc. Maybe they'd be multi-cloud, maybe not.
I don't want to buy it pre-made. I want to buy the coordination/orchestration software. And I don't want to spend forever in yaml/chef/ansible whatever to setup these things every company does. I want to download it and I want to run it. I'll give it a list of servers and some SSH keys. It can tell me if it needs more capacity. The dashboard can even be local.