Why does spot trading not have trailing stop orders?

Trailing stop allows you to say e.g. when the price reaches 1000, we set a 0.5% movement limit of which we follow the price movement downwards with before buying in (e.g. 940), and when it then moves up 0.5% we buy (940 + 0.5% = 987).

This can help tremendously against buying in too early, especially with nose-diving crypto's where limit buys become unfortunate.

This exists only in futures trading. I can't help being cynical about the reason for it not exisiting in spot trading... Seems like liquidity is prioritized above allowing profitable buy-in.