Is there a place in the dev community for those who are marketers first, and developers second?
I think this is the answer to all the other questions.
If you are developer first then staying up to date with the industry trends gives you advantage because you'll always be hireable in the trendy areas. And still is not a requirement, is just competitive advantage if you are looking for trendy jobs.
Now if you are a marketer first and programming is just a tool or skill, you don't need to keep up with any trend. You just need to be able to use that skill to do your job. If you are good at PHP and get the job done with that, awesome!
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I think this is the answer to all the other questions.
If you are developer first then staying up to date with the industry trends gives you advantage because you'll always be hireable in the trendy areas. And still is not a requirement, is just competitive advantage if you are looking for trendy jobs.
Now if you are a marketer first and programming is just a tool or skill, you don't need to keep up with any trend. You just need to be able to use that skill to do your job. If you are good at PHP and get the job done with that, awesome!