I'm not sure why I'm wading in to this debate. Perhaps it's something I feel strongly about - I'm certainly not interested in fanning the flames.
I agree with the OP mostly. Before I go any further I just want to remind everyone that there are 4 Billion star systems in this galaxy we call a game. 4 Billion. Last I read, only 0.000223% of those systems have ever been seen by the entire player base. That's insane. It could be the 'Chewbacca Defense' for any argument Elite players might ever have.
Chewbacca is a Wookie from the planet Kashyyk. But Chewbacca lives on the planet Endor. Now think about it. That does not make sense!
Players could occupy systems, build stations, have tangential micro economies, wage war, construct capital ships, get hopped up on onion head and fire plasma accelerators off blindly in to the black; and you'd never even know they were there. Most of us won't ever glance at 99.999999% of what's out in the big freeze. The galaxy is big enough to accommodate anything for everyone.
Another point, is that none of these activities are things NPCs aren't already doing. Non Player Characters are the only entities experiencing and appreciating any sort of 'sandbox', so far as they are programmed to do so. For us, the players, there is no sandbox. We are facilitators and enablers. We only tip the balance and push the arbitrary thresholds that enable the interactions of NPC organisations. It's a strange role reversal for the player in a game universe. We do not adapt. We put in the never changing ground work that allows the game to adapt. However, even that change is a bespoke, case by case curation of the developers.
This is not a simulator game. It is the simulation of simulator game. It is hyper real. It is nigh on simulacrum. (This is the main reason I can't put this game down. From a philosophical stand point it is fascinating)
This is fine. This is what Elite is. What is confusing for players like me is we keep hearing terms like 'sandbox' and we get frustrated when we can only mould the sand in a very particular way with only four simple tools. We see the scope of the galaxy, the sheer vastness of the celestial hinterlands; so many creative ideas for enterprise, mischief, merriment. Then you take a closer look and you smack your face on the glass. The greasy nose streaks remind you that this is a game; and in this game there are rules. That leads to frustration and the (implied by many disagreeing with the OP) 'grand delusions' that spark such debate.
Frontier had their vision. People fell in love with that vision and put money behind it, so I can wholly understand why those people are precious of the game and fear it changing for the worse. But if you love something, truly love something, isn't it best to let it...OK OK jkz.
Seriously, though. 4 Billion star systems.