I wouldn't go that far and I would suggest the "six to seven inch" to be more like 8 to 10 inches.
In truth, a paring knife and chef's knife in that 8-10" range can do basically everything you need done in a western kitchen.
However, a longer slicer in the 10 to 12" range, a dedicated bread knife, a 6" utility knife, and something heavy like a meat cleaver all come in way too handy for me to give them up.
Japanese design and steel was probably true six years ago. Today, there are a lot of American makers (both custom makers like...well, like me I reckon and countless others....and commercial like CKTG is doing with Lamson for their Richmond series of knives) have closed that gap. Today it's more about, at least in my opinion, proper shape to fit your style (lots of belly, no belly, or in between), proper geometry for what you like (thick to thin), and well heat treated good steel.