Started off in basics....remain
When I began building a firearms collection and started reloading at the same time, I had a mentor who encouraged me to stay with a few tried-and-true calibers. I was one who had a tendency to want the absolutely perfect cartridge for this or that purpose, and an arsenal that could do everything possible required of a firearm on the planet.
In both rifle and pistol, I have the utility .22, but my cabinet includes .223Rem, .308Win, 45-70Govt, and 12 gauge long guns and my pistols are .45ACP, with a single .357 and .45Colt. Honestly, I could accomplish everything I need to with an even smaller scope of calibers or bores, but I enjoy each one I own and am grateful for the opportunity to have them.
So, it is better for me to own just a few caliber firearms and become a master in their use than to constantly chase the perfect round, perfect platform, etc.
That said, our community and industry shouldn't sit on their hands accepting that there is no room for improvement or even revolution in firearms and calibers. The pursuit for a better caliber, a better firearm, better technology, etc., is good for the industry and the firearms community, and while you won't see me developing wildcats, I admire and enjoy watching people who do, their ambition, and the skill and patience required.