I think we will get Haste soon after if not with patch 1.18, because haste and delay are one of the biggest algorithms for melee DPS.
Haste is based on cutting delay, rather than increasing attack speed. For example, 25% haste will make you attack 33.333% faster, 50% haste will make you attack 100% faster, etc. and 100% haste would make you attack infinitely fast (cuts out 100% of the delay). This, of course, is based on FFXI's Haste mechanics, which will probably be very similar to XIV's if not the exact same. (Why make new math if you already have a prerequisite working and in tact?) So, the faster you attack, the more often you put out your extra attack, after a THF is at Haste cap, it is similar to MNK's Hundred Fists, but, you can notice a slight delay when the multi-hit doesn't proc.

What I am saying is, to get to the haste cap, to get what you need, there is a big gauntlet, one that consists of months and possibly years of hard work, and SE normally rewards hard work in their games.