A year and a half ago I owned 4 pistols. 2 glocks, a xds and a kahr. I carried three of them. Three carry guns and all different brands with different controls. I realized I was hurting myself by learning three trigger presses and 3 different control systems. I committed to only carrying and shooting a g19 for 6 months. I don't shoot that much and I honestly hadn't picked up dry fire at that point. I noticed that my skills were drastically improving. I then sold off my non glocks and bought a g26 for when I needed something smaller.
Switching to a singular platform is one of the best things I have done. I still practice/train with the g19 90% of the time. I wanted to be a gun guy. Instead I focused on being a shooter (I'm not a good one by any means). But I don't have a need to fire someone else's gun good. I want to put all my time and effort into the platform I carry. I'm a novice and I would recommend a single platform or gun to anyone else starting out. I ignored the "spend your money on ammo and training" concept. This will be the first year I've spent more on ammo than guns.