Not sure what you mean by "diminishing returns", exactly... In what way is it "diminishing"? If you need 30 copies of the same form, that's the best way of doing it.
And yes, you can spawn pages in Reader now. You can even delete spawned pages with it.
If your fields contain calculations then duplicating the pages will double the number of calculated fields, which can cause some lags after a while. Also, you would have to use a custom calculation script for it to work properly on the spawned pages.
Thank you for the reply 'Try67'. Didn't mean to confuse you by using the words 'diminishing returns'. What I probably should have stated is that I am curious to know if there exists a point of diminishing returns regarding the number of pages and form fields that may be added to an interactive PDF form before it begins to have an overall adverse effect on performance regardless of the laptop, desktop device, and OS. As I have been building, upgrading, and refurbishing both desktop and laptop computers, I have an advantage compared to most computer users. Since my Asus laptop is extremely fast given a formidable Intel processor and plenty of RAM, I myself don't have a problem. My concern is regarding those using average run-of-the-mill tablet and laptop computers running Windows 8 or higher with sub-par processors and 4GB of RAM. Aside from minimal hardware requirements over which I have no control, I wonder if this is all I should be worried about in using an interactive PDF with the ability to generate additional pages and form fields without limitation.
It's impossible to give a clear-cut answer to that question, as it depends on many factors, such as the complexity of the form, the number (and type) of calculations, the application used to view the file, the specs of the computer, etc.
Acrobat Reader can spawn templates pages and delete them since version XI (11).
Foxit Reader too, since september 2021 version.
I am used to working on this type of document, no user has ever reported a noticeable slowdown, and yet some have outdated computers.
My fields are carefully named, regarding their original doc (some template have several pages), regarding their page number, their type, and their chapter if needed.
First I create interactivity in original documents, them I import or merge them before creating the templates.
Carefully name your templates too! Especialy if some have several pages, otherwise any maintenance will turn to a nightmare.
Thanks to JR, just the response I was looking for.