This answer claims that the average time to obtain a patent from the USPTO in 2015 was around 32 months. If a patent is pending for significantly longer than this period (say, 5 - 6 years from the filing date), then is this indication that the patent application, as written initially, was very far from being valid? In other words, is it likely the case that the patent, as initially written, requires a large amount of changes in order to be valid, and so there is a large amount of correspondence between the USPTO examiners and the inventors for changes, leading to the longer time? Especially if the organization that the patent was filed under has a large amount of financial resources and experience filing patents, since I presume that this would mean that it is unlikely that the reason for the longer time is some trivial legal technicality/issue, and more-so a fundamental issue with the patent claims themselves?
I would greatly appreciate it if people would please take the time to clarify this.