So, my thoughts on flight etiquette.
I, too, am a rule follower. Yes, other people may not be. As far as bringing properly sized carry-ons, regardless of me being a rule follower, it is the smart choice. Even though they did not enforce it on your flight, they could.
Some gate agents are more strict than others. Some agents are proactive and will assess the situation. (By flight load or looking around the boarding to see how many carry on bags are there) Some simply don’t care and take a “when the space is gone it’s gone” attitude. Basically, I comply with the rules not only because I tend to be a rule follower but also, it is the best chance I have at my bag not being gate checked.
Like you, we have a segment on a carrier with more restrictive size and weight than the rest of our flights, causing us to purchase new personal items and possibly borrow a lighter carryon for Mr. Imescaping. My carryon is small lightweight just under 4lbs (1.8kg). Mr Imescaping’s bag meets the size but is nearly twice as heavy (7lbs, 3.2 kg) as mine. Air France allows a total 12 kg combined weight of carryon and personal item. Reading the flyer forums some people have been burned for ignorance to or pushing their luck with this policy.
Incidentally, this is the shortest flight segment of our 6 total segments and for that segment alone we had to adjust our baggage. The other five segments would easily accommodate our usual carry-on/personal items.
As to all of the above, (Dogs, busses, bags) it happens, some people are not courteous intentionally or not. I am sure I have made my share of etiquette faux pas. This cruise is a stretch for us, we are not in the “typical” Seabourn financial demographic, but are splurging for my 60th BD and our 40th anniversary so I am sure we will make some mistakes.
Hopefully people will just roll their eyes and move on. 😊