Cause there's no agreement about adding mild hop ups to a 318, the advice is all over the place and imagine most of the OP's don't know too much if asking on a mild hop up, leads to just a mess of confusion for them.
True for some, but imagine some are happy with a few hop up and been driving on them for years, a stock 318 performance is terrible, 250-300 hp is enough for a lot of people. Why most family sedans make that power now days.
Could and a lot probably do, but some want a little extra pep in their step without going to the trouble of a swap.
True if putting an engine in might as well go 360/5.9l or at least 5.2l over 318 la, even if wanting mild, agreed the extra displacement has a lot advantages especially for a street car, but some still want to go 318 even then but still most of them aren't looking for to much power. There's very few threads I've seen where the OP wants 400 +hp, 500 + hp. And even if someone did shouldn't be a problem with parts available to us.