maugein96 said:At the risk of upsetting the apple cart completely, no two human beings are identical, and consequently some people will play an instrument after their own fashion, regardless of how awkward or non-compliant that may seem. The books and teachers are great to get us up and running, but the really great players go on to develop their own skills and techniques that cannot be found in any method book.
A lot of us enjoy the music without worrying too much about about all the technical stuff. Some of the best players in the world have had no formal training at all, can't read a note, and couldn't care less about it.
Fair points but I'd suggest the essence of a bad habit is something that one does either from ignorance, or because it seemed easier, but which will hinder your playing later, or increases the chances of physical problems later.
Carpal tunnel problems are a big issue on many instruments. Lots of fiddlers, including some very good ones, play with their left wrist bent back, which is often classed as a "bad habit." OK you can play like that, but the chances of carpal tunnel problems are increased.It will also restrict your playing at a more advanced technical level, though some people may never want to make that advance.
On accordion if you only ever want to play oom-pa three chord trick, fundamental and major chord, middle finger on the bass and index finger on the chord will work fine, and perhaps be easier and more natural when starting out, but later on?
"Some great players break the rules, breaking the rules doesn't make you a great player!"