Never thought of my guns as a "platform."
But long ago I decided I wanted to learn all there was to know about handguns. I didn't want to get my information from books or magazines, but from first-hand experience. If I wanted information about ammunition, I had a gun in that caliber to try. If I wanted to know what a Luger felt like, I tried a Luger. How a gun/cartridge combination worked in the field led me to the woods many times.
Finally ended up with something over thirty handguns, all well tested at some time or another.