Couldn't have a $1500 10-bit 4K/60p little powerful machine with perfect colors and perfect auto-focus floating around...something had to give and it did.
X-Pro 3 (preproduction) has excellent AF in 4K but it's several hundred dollars higher priced.
My theory, as posted previously, was that XT-3 had to be crippled when A6600 came out at roughly the same price point. A6600 just happens to have a fantastic AI auto focus ... but no 10-bit. XT-3 has 10-bit but now no AF.
