Similar questions has been asked but this one is with a twist.
The doc here FAQ 13 clearly states I can take visa from X and go to Y country. But also pushing on getting visa from country of your primary destination. Interestingly none of FAQ in the doc talks about being loyal to your initial itinerary.
Hence my question is let's say I take visa from Spain stating in itinerary that I will only go to Spain (no brainer) and I get the visa.
Now what if I change my itinerary (once visa was issued but before entering Schengen) in following ways:
I add 6 more countries to my plan but still ensure Spain is my primary destination, like out of 10 days, spend 1 night in each of 6 added countries but 4 nights in Spain
Double my total number of travel days but ensuring it's still under what is allowed in the visa issued, like less than 90 days, leaving Schengen before valid until etc, also I ensure proper hotel and flights reservations
Will these kind of changes still raise eyebrows at border patrol or make Spain feel cheated?