[michaelmior]

I'm not arguing that's it's not useful to know design if you're working with designers. My comment was just that I think it's reasonable for some developers to want to stick to development. I also think there are plenty of roles available where the lack of desire to learn design isn't a stumbling block.

I do think it is possible to be good at design and development, I didn't say it was impossible. But if you want to keep growing in both, you have to invest time in both. Inevitably this means less time spent on each of the two things individually.