Yes i do agree with you, allot of questions guilds have on their app are filler but at the same time its put there not so much for a right or wrong answer reason but more for a show of care on the applicants side. A well done app shows allot toward the way of how serious someone is. I'm not saying an application has to be a book and you need to describe everything but it shouldn't be horrible for an applicant to spend a little time on it to impress the people he wants to join.
your last statement btw about "bad guilds with mediocre progress using application forms longer than an income tax return and that can't keep asking pointless questions." sounds like its coming from personal experience. Every guild regardless of their end result is entitled to represent themselves in the best manner possible. The logic behind bad guilds with a detailed application process is flawed because what are they going to do when they fall behind in progression? Drop their app and mass recruit everyone b/c they're deemed "bad"? If anything if that's probably more of a sign to filter out the undesirables.
Again, the care and dedication an applicant should bring to their desired guild should be reflected on their app regardless if the guild is world 5 or world 5,000,000,000,000,000.