will you release a non-working App or an App that take one year to load? I don't think you will do such thing. Identifying a wrong App and functionnal issue is something formal (either it work or not) but when it come to UI it's a different story.
You can spend days building an UI you think is good but later no one will use it because it's bad.
No one will accept a fast App with a bad UI but everyone may accept a laggy App having a perfect UI.
And if my databasen doesn't work and produces wrong answers or take way to long.
No one will use you UI neither.
I take a basic UI before a malfunction application any Day of the week.
I take a reasonable working application with a great UI before the great with a basic UI also all days of the week, as Long as it works ok.
Basic proper function IS most important.
A pig with geat makeup is still a pig.
But yes, when you have working base, UI makes a difference.
will you release a non-working App or an App that take one year to load? I don't think you will do such thing. Identifying a wrong App and functionnal issue is something formal (either it work or not) but when it come to UI it's a different story.
You can spend days building an UI you think is good but later no one will use it because it's bad.
No one will accept a fast App with a bad UI but everyone may accept a laggy App having a perfect UI.
I guess you have no experience in Finance world :) Not everything is IPhone app...