Sounds like you take "listen, listen, listen" to the extreme. That is the best way to learn. .
That said, there will be some styles of music where just listening and analyzing probably isn't enough. Anyone would be hard pressed to write a "big band jazz" piece without having studied jazz harmony or write a fugue in the style of Bach (I did that for a game once) without having studied baroque counterpoint. And even in orchestral to a certain extent, formally studying the ranges of instruments, how the blend with each other, i.e. 'traditional orchestration' can go a long way towards getting a style 'right.'
At the very least, formal study can be a short-cut to really getting to know a style.