None of these would be drinking bottles of formula if they were not still breastfed
No, but the vast majority of them would be drinking cups (or, in many cases, bottles) of cows' milk or a nondairy milk, and a large number of them would also have dummies. Formula wouldn't do them any harm (and in fact formula companies are vigorously selling formula to older toddlers in the form of "stage 3 and 4" milk, most people simply make the switch to cows milk for cost reasons).
Bottle-feeding formula at all is a very artificial synthesising of breastfeeding. As are dummies, and for that matter thumb-sucking in toddlers and small children is a copying of breastfeeding to self-soothe.
Formula is expensive, so most people naturally switch to a cheaper alternative once it's no longer strictly necessary. Bottles are also problematic for teeth (and hygiene, for that matter). Breastfeeding is free and does not damage teeth.
What it boils down to when people say "but they don't need it" and "it's just a comfort blanket" and "it's more for the mother" is that they basically think breastfeeding at all, ever, is weird and sexual and dirty and inappropriate, or whatever cultural conditioning they've picked up, but they know that view is indefensible and daft, as well as completely not supported by the science. So they set artificial and arbitrary limits around when it's OK - it's OK just for a newborn, or it's OK until they have teeth, or it's OK because when they're tiny they really need it for food, or whatever. These boundaries are also helpfully shiftable if challenged. "It's ok if you're basiclly forced into doing it because it's better than formula, but it should be 100% strictly for the baby's benefit, and if you get anything out of it at all, your motives are dodgy and probably harmful". What a sad view.