Anything with a smaller market size (e.g. than Windows) means higher cost (in developer effort) per feature per user. It can also result in slower development and potentially less stability, resulting in negative customer reaction (which is a significant risk).
The following is based on figures from http://www.netmarketshare.com, figures for 2017
It's widely assumed that a higher proportion of MacOS users (under 10% of desktops) are likely to have interests in media software (such as a DAW) than Windows (about 90% of desktops). Is it ten times as many? I don't know. It would need to be to achieve parity in market size. The Linux market is a quarter of the MacOS market - so you're looking at needing about fifty Linux users per Windows user interested to achieve parity, which isn't realistic.
Similarly, iOS will likely have a higher proportion of users interested in media software than Android, despite the numbers being like 65% Android, 35% iOS on phones and tablets. Here, only twice the number of users is needed to achieve parity and that's believable (if not easily exceeded), as Android typically isn't seen as a media-oriented platform.
Any market smaller than those main five end up being minuscule and hence needing unrealistic proportions of them having a potential interest in a commercial DAW to make it appear, to me, for any consideration to be given.
Note that latency on Android is an issue only if you're trying to play/mix live - for sequenced playback, it's not a problem. (As another example, Stagelight is a fully featured DAW that's available on Android and Windows, with the only additional feature on Windows being VST support.)