I know several people that believe a separate crimp die is essential to the reloading process. I have not found that to be the case but that doesn't make them wrong. Reloading equipment is sort of like underwear, everyone wears them a little different. If you feel that you get a better reload with a certain set or brand of dies or by using a certain technique, and it works for you, you are right.
I helped my next door neighbor set up his reloading room and found him a RCBS RC Jr. to load his 7mm Rem Mag. because he was having trouble with his Lee press. Nothing wrong with the Lee (if you like them) it just wasn't up to the task on the 7. I also encouraged him to get together with several of his hunting/work buddies, that reload, and spend some time watching them reload. As I explained, everyone loads a little different and you will take what you have observed and modify it and come up with your own techniques that work best for you. (As we have all done)
I have been reloading for 50+ years and still use most of the same gear that I started out with. Is there better gear today? Maybe so but what I have works for my style.
I am Not an expert but my system works for me. Any system that produces good, safe reloads, within the standards of the reloader is the right way, at least for him/her. And method of crimp certainly falls into that scenario.