Yes, Michele, that’s the argument against a one-brand approach to anything. All of us face the same choice in several areas, most notably cameras and cars. If you buy one brand of cameras, you can swap lenses between them and once you’ve mastered the menus on one, you’ve pretty much mastered them all. You can generally pick up any of your cameras even after months of disuse and still operate them competently. Same for radios. The menus are complicated, as are the digital modes, memory systems and so on. Sticking to one brand minimizes that while exposing you to problems if your one selected brand dies or starts having problems.
I’ve chosen one brand (Fuji) for cameras and I’m moving to one brand (Yaesu) for radios. For cars, I’m still promiscuous. 
*Death is everyone’s right.