So... leaving aside the term sandbox, what are you doing in earlier Civs that you can't do in 7? What am I missing? It seems a common criticism and I just can't wrap my little brain around it.
I might try to describe my usual way of playing that I assume (since I don't own the game) is not possible now
- map type: pangea (60%), continets (30%), other (10%)
- map size: standard (I think below 50%), bigger (the rest)
- speed: standard or epic (divided equally), sometimes dipping into marathon
And then I don't have any specific goal in mind. But what usually happens is I just try to color the map by efficient play in all the other aspects of game. Even when I'm close to some victory (usually science) I will just stop pursuing it one step before finish line and continue my coloring of the map. For that reason I recall I had to turn off religious victory, because while conquering it could happen unexpectedly.
And with that framework I don't think it would be possible to have fun in civ7.
Pangea map is most of my plays, forced idea of old and new world and exploration era just breaks it. I want to be able to meet as all nations as quick as possible with early exploration and then look how everything unfolds. Then if I'm playing on continents map, I want to decide, if and when I will put my color on second continent. Maybe not at all, maybe I want to beeline it, or maybe do it at specific time, for example nuke it out of existence. That part maybe is possible to some degree, because I keep hearing, that you can ignore exploration era forcing you to explore, but I assume you can't beeline it in first era. That part for me is the strongest argument to call civ7 heavily narrated instead of sandbox.
Map size is obvious. And besides size itself secondary benefit is a lot more nations on the map. They will bring them back, but I'm worried that they are not here yet not only because of Switch limitations but also because of balancing issues. I'm almost willing to bet, that first patch introducing it will show that bigger map sizes are completely broken for some combination of other game settings like marathon speed was at release.
Then epic speed - I like continuous uninterrupted playthroughs that can take in total 20+ hours. And here what I'm getting is 3 minigames below 200 turns vaguely related (because I don't like the idea of taking from me some part of empire I built, resetting my ongoing wars) to each other.
I recall from your posts that you mentioned often to not finish games in previous civ and current one solved it for you. In my case it's completely opposite. Not finish my games was never a problem to solve. In attachment there is an example of epic speed large map finished with total conquest where I think I have 100+ cities. I assume it took a lot of hours and was possible to win by any other condition a lot quicker. But I decided to have fun in this game in a different way and I was allowed to.