Bittrex has been doing that for some time now. They are one of the shittiest exchanges that haven't stayed up to date with the current exchange norms. They apparently do it to prevent their servers from having to spend extra resources in looking up the trade history for a user.
that is disgraceful... every other exchange has trade history. There should be pressure to reintroduce this vital part of trading.
Also whats with the deleting the orders from the order book after a while.
these 2 things are quite annoying and detrimental to trading there.