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On box mods(the big vapes you might recall starting to see 10-15 years ago) there is a chamber up top you have to manually fill with nicotine. This can be a bit annoying to do but the real problem is remembering to bring liquid to refill with.

That’s really the only negative to the large box mods, other than having to recharge 18650 batteries all the time. But disposables are usually much smaller(easier to hide if you’re in school), use nicotine salts(which are much more potent) and they usually last a long time - sometimes 20k hits. So these aren’t “bad” products, they have a lot of selling points.