PvP sets season 4

Dear Blizzard,

I just noticed that on the PTR it says the pvp sets of season 3 are now the pvp sets of season 3&4. Why do we not get to grind for the pvp sets of previous seasons that were voted on by the community just like the pve-ers? I did manage to get my favourite pvp sets in season 1&2 but I was really looking forward to still getting some that I had missed out on. I think it also keeps the game fresh for a lot pvp-ers, it’s something nice to grind for. I hope that this can still be changed before the season starts.

Best wishes,
Shiggy