It depends on every individual, what the end product is for being a commercial pilot. Lets assume that the end product is getting command on a wide body, there are so many paths to get there.
Ab initio and being sponsored by an airline.
Getting your own licenses and hours and get on short course route.
Being a CFI and clocking hours for Direct Entry.
Etc etc.
It just depends on what path you would like to take en route to the end product. If you enjoy instructing and clocking hours as a CFI by all means. If you don't mind jump seating as an SO for afew years then its all good as well. Could also try joinning another airline or regional airlines to clock hours as well. etc etc
Many different ways to get there, no real right or wrong.