For example, let's say I want something to "build infrastructure". That's really way too generic to be useful.
What I actually want is something to create a cluster in AWS to run my app, or "create me a Fargate ECS cluster using R53, ACM, ALB, ECR, Lambda, CodeBuild, CloudWatch, SG, VPC, and IAM". If I feed that thing my AWS account's root credentials, it should first go through a list of default variables, explaining each to me and why I might want to change them. Then it should just create all of the above for me, and probably save it all as code. Next, I create a repository with my app and a Dockerfile. I then run a "hook up my git repo webhook and deploy my app right now" script, passing it my github creds. That should create a webhook into CodeBuild where my app is turned into a container, pushed to ECR, and then deployed into the Fargate container, as well as creating any CloudWatch alerts needed.
That's what I call a "product solution": an opinionated, complete solution that does everything I need for me, with a very light user interface and guidance on how to use it. Probably 95% of the above is two custom Terraform modules and some glue, and I should only have to answer like three questions by default.
If Terraform itself shipped with the above complete solution, that would be what I'm looking for. But I'm not aware of a catalog of solutions like that. Occasionally random people will publish partial modules on GitHub, but those usually need more modules and glue to actually work. So I'm basically looking for "no assembly required" solutions with the option to modify them later.