Internal tools never get the same attention as public-facing products.

Public facing products have competition. Internal tools have a captive audience that must use them, no matter what.

Good is a big word, but they exist and have docs. A lot of the time the docs are even correct, if you can find them.

I have most often interacted with their APIs via the golang library. Compared to Azure, the AWS stuff is pretty solid.

Everyone says this, but in terms of discoverability of the actual apis I have found the opposite is true. Azure tends to have docs with small mistakes, but they are extremely thorough. With AWS it seems to be a tossup: You can be lucky and have complete and accurate information, or you can be fucked.