So you are telling me that I can easily exchange development time which I would have to pay for end-user resources, which I would not have to pay? Sounds like a great deal.
Then I hope we would also tax the bad UX of the competing 20-year old Frankenstein applications, which lead to slower business processes (= more resources used as well).
Your last sentence hits the nail - many users don't have a choice in selecting the application, and due to industry fads can't expect to have a better option.
I can make a great chat system that uses fast native client, but it won't change the fact that Corporation A paid for a slack license and won't switch to mine.