The problem with SVE is that ARM vendors need to make NEON as fast as possible to stay competitive, so there is little incentive to implement SVE with wider vectors.

Graviton3 has 256-bit SVE vector registers but only four 128-bit SIMD execution units, because NEON needs to be fast.

Intel previously was in such a dominant market position that they could require all performance-critical software to be rewritten thrice.