The longer a smartphone stays on the market without an official release of TWRP, the less of a chance that an official release will actually happen. There are many variables that are involved in a device to be officially supported by the most popular custom recovery though. It typically boils down to how much interest the community (and its developers) have in a smartphone. However, we have seen OEMs sending out free devices to select developers so they can release their work on the device.
But anyone who bought the Galaxy Ace 4 back in 2014 had likely lost all hope that it would recieve official support. Lesser known devices do sometimes get unofficial ports and there are times when these unofficial ports work better than the official one. In any case, those who own the Motorola Moto G6, the Nokia 6.1 or the Samsung Galaxy Ace 4 can now replace their stock recovery with TWRP.
Source: https://www.xda-developers.com/motorola-moto-g6-nokia-6-1-galaxy-ace-4-twrp/