There is no difference. You think you have waste $70 dollars just to know you're not interested in the changes made to a very established formula especially in a day and age where you can vicariously experience games through streamers and youtubers?
His post made perfect sense especially from the context of a self-declared war monger, he doesn't like the devs taking control from how his game will play out from him. Do really you think someone has to buy the game to tell you they don't like how Ages are designed? or that they don't like how they took away map customization in favor of making every single game a glorified Terra script?
A long TLDR: You have to play Civ7 to know if you like Civ7. Trust no ones review or opinion but your own. No one really truly understands why anyone else likes a Civ game anyway. Neither do you. It's the biggest niche mass market strategy game enjoyed by millions of casuals and non casuals but also a small fish in the big pond of billlions of gamers that play games. Wait out denuvo, or wait out the price, but you can't really judge it until you play it.
The thing about Civ is that with the interaction of the mechanics and how the game plays, most players don't understand why they *actually* like or dislike a certain civ game over another and don't have the proper vocabulary to even describe it. Watching gameplay isnt enough, unless you have a god tier level understanding of game design and the self awareness to apply it you really just have to play to know.
I have 10k+ hours in Civ4 and 6k+ in Civ5. I think 4 is a superior single player experience due to the ai and mods. I hated 5 at first, but if you want a tight, balanced, and competitive multiplayer Civ it's just the best and it grew on me. With VP the single player in 5 is also in a good spot now.
Civ 6 bounced off me everytime from launch and at each major expansion, another 50 hours thrown at the thing to see if I could pull out the fun. Never could find a niche for it. Threw another 100 hours into 6 trying to find the right mod set up, seeing if I could find a fun TSL earth map experience and never really did. Modding support never really came through to my understanding.
While playing Civ6 I realise it's a very polished and excellent game I just dont find it *replayable* fun, and I think that's what makes Civ, Civ for me. For example Endless Legend is one of the best 4x I've ever played. But I could never play more than 200 or so hours of it... it's just not *replayable* fun like Civ. You go through the factions enjoy the narratives play a few extra games and then you're done. Dip your toe in MP, realise is silly unbalanced, have your fun. Balancing EL perfectly for MP would kill its charm, it's great for what it is, and in no world is a game I put 200 hours into and enjoy thoroughly a bad game or a bad experience. It's just not a forever game.
So yes Civ 6 is a great game it's very streamlined and all the mechanics work well together, very polished. I got my 300 hours out of it. But as a Civ game for me, it's also not wrong to say, my god Civ6 sucks. On so many levels. It's not a forever game.
Districts suck. Adjacencies suck. The ai sucks- exploit it. TSL earth sucks- ruined by cities the size of continents and loyalty. But loyalty is also good, because its balance. Religion sucks- just ignore it. Or exploit religion, its extremely powerful. But you can also just ignore it. Governors suck. Policy cards suck. Eureka and inspirations suck. Everything comes down to ignore it, and play worse players than you/lower the ai to compensate for it, or min/max unfun systems because you have to.
It's a bunch of boardgame-like, and deckbuilder-like systems and they just suck the fun out of any replayability.
All this ranting just to say, I *should* dislike Civ7 for the same reason I dislike Civ6. On the surface a lot of the things I'm not in love with are present, and on its face, ages *should* be something I hate. But Civ7 is great for some reason, replayable fun in a way Civ6 isn't, and the most I've enjoyed a modern vanilla Civ on launch since Civ2. And that's factoring in, somehow, without hyperbole, THE MOST INCOMPETENTLY FRUSTRATING UNFINSIHED UI/UX EVER