Colin Walker writes:

It’s a little bittersweet — on the one hand it feels good as I know that I have a new solution but, on the other, it feels a little sad that the fruits of so much time and effort are now redundant.

I had exactly the same feeling when moving from my kind-of-microservice-architecture to my new GoBlog solution. But I think all the time and effort was still worth it, I learned a lot and had a lot of fun.