Healthy for who? The way you're using it, healthy is a weasel word.

If someone is paid to literally write code, it's perfectly healthy for them to want to only write code and not provide free labor in a different domain.

I'd go so far as to say we currently have an unhealthy culture if we're expected to provide free training to everyone.

Job training used to be, and still should, be an explicit responsibility of the employer. Not an underhanded sneak expectation that's unofficially forced on people who were hired for other job descriptions.