Somewhere like Segestica, you won't get a chance to build temple of ceres, sewers or any such, for ages unless you do the farm upgrades because it's base fertility is so poor. It is a struggle to get it to 3% growth rate on a small starting population, with shrine of ceres alone (farming boost retainers prob are one possibility). You could get insta growth by having a governor there and in few other towns, when you go capture & enslave somewhere large like Carthage, but that pop boost is likely to be spread around as it's needed elsewhere.
There's loads of place relatively underpopulated, and not that fertile, which really can use the upgrades.
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