I really hate commenting on this thread due to the way OP’s post was written. Perhaps, they were trying to be funny?
Regardless, as a primary app user, I do agree that the number of error messages that pop up (including those that don’t actually seem to affect my user flows) is a bit much. However, I will say - I actually find Marriott’s app faster than Hyatt’s app, which while beset with fewer errors, seems to chug along slowly with loading many times.
Still, though, Marriott could definitely invest in improving the reliability of their information technology stack.