No-one can tell you that you have to use a pacifier - not all babies accept one, they can confuse the breastfeeding dynamic sometimes, and in cultures where pacifiers don't exist, no-on is being a "bad mother" by allowing their LO to comfort nurse. Pacifiers are a nipple replacement for normal natural feeding and comforting behaviour. If you want to try one for those times when you need to go make a meal etc. then that is a choice you are free to make, however comfort nursing is nota problem that needs fixing - and even if it were (some babies don't nurse effectively and only do what is called "non-nutritive sucking" which leaves them attached to the nipple all the time but losing weight and dehydrated) offering a pacifier wouldn't help. Pacifiers are a tool we can choose to use or not use. There is no rule about what you must and mustn't do beyond being responsive to your child's needs.
I never said that anyone is a bad mother for letting their LO comfort nurse for long periods, just that I
personally can't always have him attached to my boobs for
2-3 hours straight. Btw isn't cluster feeding baby feeding more often but not for long stretches at a time? Mine isn't doing that, he's occasionally doing marathon feeds of e.g. 2 hours straight with almost no break in between. As far as I understand it, long sessions don't bring up your supply, it's baby feeding more often which he technically isn't doing, he's actually feeding less often by doing that.
I'm well aware that pacifiers are replacements, doesn't mean they can't be useful tools now and then for those that wish to use them - doesn't make anyone a bad mother choosing to use pacifiers. E.g. my DH's mother is a great mother and she bf but also used pacifiers occasionally - doesn't look like any of her children were harmed emotionally from it.