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We saw the same with AMD/Intel building their own instruction sets. AMD has only recently entered the server market as a serious competitor, but limitations like a lack of AVX512 seems not to be a bug issue so far. The result is either binaries with multiple code paths, optimised for each specific design, or binailries only leveraging the common ground.
If an ARM server comes out on top, I'm sure the ARM server market will centralise the same way it did around Intel before EPYC got traction.
With x86, there are AMD and Intel. With ARM, how many designers are here? With more designers, the smaller the potential common ground is, and more code paths to optimize, thus cost more to build.
ARM has their own design team, as does Apple. Google and Microsoft are supposedly also launching their own ARM chips, but they're behind on Apple by a couple of years. Samsung designs Exynos, Qualcom designs Snapdragon, and then you have Mediatek, and HiSilicon.
Many of these companies start out with the chip designs they're already paying ARM for and tweak them to their need. Apple is the big exception here, beating ARM at their own game by using ARM's ISA but designing better chips to run the code than ARM has been able to.