If you want to get a glimpse of the reader experience using your legacy appraisalware, try filling out the Appraisal Institute SFR form without adding narrative addenda, then imagine adding thumbnails of your comps in the SC grid and more detailed site and improvements descriptions.
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Just in general and excluding the "extra" in the level of detail in the 3.6....
When the base form can accommodate everything you need to say about a subject (with only rare exceptions) reading a dozen of them for content and from different appraisers will become a very different review experience. Whatever you have to say about the site is always in the same place in every report regardless of who. Whatever you have to say about the subject - and its condition - is in the same place in every report.
There are 2 problems with all-narrative formats and the extensive use of narrative addenda:
1- everyone does the sequence and the content differently from one another. If you're only reading one report that's a little cumbersome but when you're reading a lot of them the "easter egg hunt" it takes to figure out where something is addressed in a report becomes a hassle.
2- a reader has to be savvy enough to spot any omissions. On a structured form, a field that is left blank leaves a noticeable hole, but in a narrative format an omission leaves no hole; it's simply not addressed. A reader has to know what they're looking for and check a couple times in order to ensure they didn't miss the it, lest the response turns out to be "read the report, I already addressed this in the addenda". Running into that hassle (take 2-3 passes to know for sure there's a hole) a couple times a day becomes annoying.
Assuming similar levels of detail (which is not the case with the 3.6) a generally more reader-friendly report layout doesn't make the report writing go faster, except to the extent we're avoiding repetition between the base form and the addenda. But it does make reading reports for content go a fair bit faster and easier.
Aside from that, if we know a lot of appraisers are commonly allowing the SR1 development to follow (instead of lead) the SR2 report format it becomes even more critical for the designers of these formats to structure them in the more logical and consistent layout.