I generally don't play games on vacations, but travel time is an exception, and I sometimes carry a console just for that reason. The (3)DS is perfect for that: compact, robust, good battery life.
...and my whole family is the same :) We just grab some snacks and a light snack from a shop and hole up in different corners of the hotel room to just relax and unwind.
I can’t imagine, e.g. - going up to the cottage and bringing a console or handheld with me…
The idea of a vacation is to disconnect, no?
Probably the bigger takeaway for you is that everybody’s reason for vacationing is different — not everyone has access to a cottage for example.
If games help someone do that, it sounds fine to me. Just don't bring any F2P skinner box games.
Unless your vacation is to Las Vegas?