Ah, Cao, in 1970 the Spotmatic F didn't exist.

In its day, the Spotmatic was among the smallest and lightest of full frame 35 mm SLRs, both good attributes to have.

About having a "Spotmatic/RB67 shaped brain," well, our preferences do tend to conform to the tools we use. That's why its hard to get good advice on "the next camera for ME;" everyone recommends what he uses and knows best without regard for the quirks etc. of the person asking for advice.

Bounce around in ditty bags? Not likely, I was at Materiel Command HQ. Everyone there and their cameras were pretty pampered.