This might not be a real answer, just an opinion.
Every web developer should decide if they "need" a feature.
In my opinion, the unit itself is a bad implementation.
DPI is a unit intended for print, specifically a unit to measure the capability of a printer to produce a small dot.
But in electronic mediums we have not a dot, we have a pixel, which has ...
You have a mobile site that uses separate URLs. That is in the same category as m-dot sites, but your site doesn't use a mobile subdomain, it uses a mobile subdirectory.
From Google's mobile SEO overview, the three types of mobile designs are:
Responsive Web Design
Having a /mobile/ subdirectory puts your site in the "...
downloaded to a mobile device the links and back buttons no longer work
Not all PDF readers support all PDF features, so the simpler you make a PDF the more it will work as expected.
I did not see anything wrong with any Links (please update your question to provide a specific link not working).
As for the "Back" buttons, I can see that they do not follow ...
Is this a bug in Google's mobile testing tool? - May be a bug also. Because I also faced the same issue while dealing with some of the websites.
As I checked those pages were Mobile Friendly.
As I observe running Adsense won't be the reason for that.
Couldn't really tell if they will hurt your rankings given your situation but I'd recommend to have things fixed so that you do not possibly show any chance for Google or your competitor to get ahead of your rankings.
Below is just a use-case for your understanding:
Case A: No effect in rankings unless any new algorithm that prioritizes for page-load ...
There could be many reasons, and each missing page could have a different cause. For my website, several of my missing "pages" are only images.
I would suggest you export your list of mobile pages and then the pages that are valid from the Coverage section. You may have few sections to export under Coverage:Details. Then using VLOOKUP() in Excel ...
When you use this test, note that many ad tracking pixels/scripts (even Google's pixels and Doubleclick's pixels (Google owns Doubleclick)) may be blocked by their own robots.txt file that you cannot control. I've seen this first hand in one of my own sites -- Google blocked their own Doubleclick pixel from being scanned by the Googlebot. You have to ask ...