As much as I hate being a corporate shill: ask yourself this. Is the game worth the asking price with no DLC? You don’t have to buy every DLC, that’s just the cost of the additional game development time. And maybe the game isn’t worth the price now, but in two years you can probably pick it and a few of the best DLCs up for the same price as it is now and get your money’s worth.
Tedious: too long, slow, or dull; tiresome or monotonous
I think what you were going for was challenging and/or punishing. The first game explicitly has ends to each city type, and I certainly wouldn’t describe watching the city steam a man alive to get the people to tolerate you putting sawdust in their food “dull”
Civ 7’s Antiquity Age is fine. A different take in many ways, but it was interesting enough. The age transitions and general gameplay loop of the following ages get progressively less enjoyable though.