Yes this is true. An ms-8 is a processor and will do the settings for you. But if you don't have that kind of money to spend and are able to do the setup manually u can save yourself alot of money of course at an expense to your time. Center channel is more of a vocal fillin if your sound stage isn't sounding right possiblydue to speaker location or llimitations.
There are many ways to do it digital time correction, 31 band eq all make for a better sounding system it just comes down to what you have and what you can afford.
Ps I volunteer to test drive an ms-8 if you want to give me one