That close minded opinion you quoted left a bad taste in my mouth and makes me not want to check the OP's blog out.

Almost every opinion people have has been covered by someone else in some way unless you are working at the forefront of something, so it usually depends on how you value-add to existing things with your own experience.

It's also that sort of I-know-what's-better attitude that turns a personal thing into a competitive thing.

What is semi-successful anyway...

You’re missing the point.

OP is saying don’t be the person who says they want to write about Frogs, but who then spends an immense amount of effort not writing about Frogs, and writing about procrastination instead.

If it had been phrased like yours, I'd completely agree. I reread that part from the OP, but the point really doesn't come across.

Nothing wrong with that either. It is an unpaid hobby. Doing what you feel like doing is perfectly fine.