the problem with companies is that they will not want to expend more than they need to. Think about it - if you worked for a company that made water jets for cutting metal would you bother to write software on an iPad to somehow integrate that into the CNC machines you design? I mean that's even if the iPad can even do that in the first place. You'd use cheap Windows XP machines to do all the grunt work because it is cheap and better to write software on that platform due to the cheap costs of the components needed to build a PC.
In this world it comes down to economics - every company doesn't want to lose money - Apple is not in it to lose money and many see them as a WTF company - who are they to make an iPad and iOS and then tell me that I need to use this over a $100 computer I can make on my own (not including the costs of Windows OS software). WHy should we let Apple dictate this is the future of computing that is on an iPad using iOS?
If companies did make software designed to run on iOS then that would be awesome - but in our legacy software industry people don't change for the sake of changing. There is zero incentive for any established company who's software is the foundation of their business to switch out and use iPads just because it's hip to do so. That's why these legacy software they are using are so susceptible to viruses, malware, ransomware you know it it'll have included.
If I am to start up a company today and if I can possibly write software to support my company's operations I would definitely invest in Apple because in the long run I would not have all these issues PC's (Windows) have. I'd be sure it will be awesome to be able to run my company from mobile devices and not have to be locked down to old PC hardware.
Unfortunately the world is huge and no one wants to spend the money so they are stuck with legacy crap they must support into the future. They can't benefit from any of these new gadgets that can make work easier. This is why we have not advanced far as a species yet because it comes down to profit margins and the way of life is basically the pursuit of materials things and not to better humanity. Sad
/end soap box rant.