I know neither of them are as nicely opinioned at those two services but there is starting to be plenty of more opinioned Kubernetes deployments.
k3s is probably most well known as it ships with bunch of preinstall software: https://github.com/k3s-io/k3s so you can just start throwing yaml files at cluster and handling workloads. It's what I use for my homelab.
Paid things I've heard of include OpenStack and SideroLabs. Haven't used personally by SRE coworkers say good things about them.
Plain kubernetes is as useless as a plain Linux kernel without a userland around it, and normally you don’t want to build a kubernetes or Linux distribution from scratch.
It's pretty minor problem overall though.
But honestly I think the big cloud providers don’t want their kubernetes offerings to be too easy to use, they try to nudge inexperienced people to use their proprietary serverless products. Kubernetes does make switching to another cloud provider far too easy ;)
I think you need to flip a flag on the cluster object to enable the Gateway controller.
As SRE who deals with a ton of Kubernetes clusters, I find a ton of needlessly complex clusters because rookies setting up the clusters didn't understand the implications of their actions and grabbed whatever a blog post said was good idea.