In my humble opinion i‘d expect a company the size of Mikrotik to deploy their management tools x-plattform. There are way smaller companies that don‘t forget about their apple and linux community.
As administrators we are on call 24/7 and on the road most of the time. There should clearly be official version of Winbox for iOS and Android. We are in the year 2018 after all.
Those other small companies apps barely function and mainly exist as marketing tools(not to mention they don't have anywhere near the features/functionality). Besides, if there's an urgent issue that needs attention it's not like anyone would use an app anyway...
Thankfully mikrotik doesn't mess with that nonsense and gives/supports the tools you actually need. I've used winbox remotely dozens of times without issue and can't imagine anyone else not being able to figure out a way to do it either.
But I get where you're coming from, so if they were to revamp their config tool, making a super high quality universal web based one would be the way to go.