Agreed, it's a good system and is more accurate than 128tick, even though it's not perfect. E.g. the client still only shows the muzzle flash on the next tick, so up to 16ms after the shot was actually fired [1]. This is probably one of the reasons some people can tell the difference between 64 and 128tick, as the game might feel more accurate, even though the hit registration isn't in any meaningful way.

[1] https://www.youtube.com/watch?v=4jfo6sWhLFs