[moonchrome]

> I’ve implemented “buy” for various systems where the work to integrate was essentially the work to build

I've felt this way before, but I didn't realize that I haven't factored in the risks of actually building it. I was comparing real world integration effort with an estimate, influenced by my experience of integrating with a working product.

Common sense applies, but in general I'm terrible at giving estimates unless I've done something very similar before.