There is yet another issue: the end-users are fickle fashion minded people, and will literally refuse to use an application if it does not look like the latest

There is yet another issue: the end-users are fickle fashion minded people, and will literally refuse to use an application if it does not look like the latest React-style. They do not want to be seen using "old" software, like wearing the wrong outfit or some such nonsense. This is real, and baffling.