I've never bothered to take the tire off to true a rim, unless I'm taking the tire off anyway, i.e. to change it or the tube or replace a broken spoke. Otherwise, you can leave it on.
Note that if you remove the tire and put it back on, you'll probably also have to balance the wheel again. TL;DR: it's all hassle, no benefit.
I have never used a weight larger than 1/4 ounce on my bike rims and usually only need two or three at most.
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