I guess I'll kick it off. One thing I've changed my mind on over my career is the practical importance of specific technologies. There are languages I love and

I guess I'll kick it off. One thing I've changed my mind on over my career is the practical importance of specific technologies. There are languages I love and languages I think are wet garbage. But when I look at products succeeding in the world, there's just a very low correlation between "great technology" and "product delivering a lot of value". I've seen bad teams fail with great tech, and I've seen great teams succeed with tech I dislike. That hasn't made me any less critical of bad tech. I could write a book on the flaws of some of the popular things I've used in prod. But it does mean I've learned to put aside my personal aesthetic offense and say, "Ok, let's focus today on making things better for the users."