After many years of travel, all I want to do is travel lighter.
It's not just that it's getting harder to keep luggage below size/weight limits. I do not travel alone, and travel partners do not like to stay in one place very long for the amount of time required to justify some types of gear. For example if a situation might require lens changes, tripod setup and takedown, long or multiple exposures, setting up strobes, on a normal vacation type trip I may be with people who don't want to stand around waiting while I manage all that. A lot of people just want to take their phone pic and move on already, and you find yourself constantly lagging behind the group and frustrated that they already want to get back in the car...
With security generally higher everywhere, if I want to visit some museums or sights I may be required to check my bag at the desk before entering. I do not like to leave expensive equipment behind in a lightly guarded room near the front door. It is easier to have a small bag or equipment I can just leave slung over my shoulder so I don't have to check anything, just go in and enjoy the place.
On many trips 98% of the photos are just trip documentation with no potential for "art". This is what made me switch to an RX100 as main travel camera, but today a good phone will do as many pros will tell you. The RX100 fits in my pocket but is very competent with the option of manual exposure and focus, and the 20MP raw images make great prints. I do carry a compact full frame too, but it stays out of sight (from thieves) in a small bag unless a photo opportunity is very special. Then I will ask if we can stay in one spot for a couple minutes so I have time to get it right, and the nice camera comes out.
The more gear you bring the more time you need to justify bringing it. If you are going to bring a tripod, strobes, filters, very specialized lenses, and a whole load more then you need to extend the trip by the time needed to actually make use of all that crp. Like if it would have been a 5-day vacation, I seriously think if that is also going to become a photography trip it should become a 7 or 10-day trip.
If it is going to be one of those "whirlwind tours" of like 1 or 2 nights in each location with packed daily itineraries, I would say screw it and travel light. One good camera, one good lens. You won't have time to settle down and set up in one place for very long. Be a photographer, not a technician.
If you must be a technician, one thing that has worked best for me is up to 1 week in 1 location. Then there is time for days when I go off by myself with my full frame, travel tripod, and second lens, and spend whatever time I want on a single shot.