I find ECS/Fargate and managed Kubernetes not a bit easier to manage than Kubernetes itself. On the other hand, the inflexibility or vendor-specificity of these

I find ECS/Fargate and managed Kubernetes not a bit easier to manage than Kubernetes itself. On the other hand, the inflexibility or vendor-specificity of these requires as much learning as you'd use FOSS tools. Also those skills are not transferable to an other cloud vendor, which might happened to be required if your primary cloud provider does not cover markets you supposed to operate in.