I am quite fond of districts in Civ 6. For one, I think it is more realistic that cities spread out over multiple tiles rather than everything being in one tile. For another, it makes each game less formulaic as you have to pay attention to he terrain a lot more. It also adds a level of strategy to the game that was previously lacking when it comes to disreict placement. There is also a tactical level it adds to the game as it allows you to build true defense in depth by careful placement of districts, forts and baracks. I used to insist in building every building in every city like @Synsensa and so was frustrated by the choices that districts force on you but I have come to love it.