BigNitch,I didn't not bother to read your post but I admit to missing that out in my haste - I was on my way out to do some work. For that and if because of my haste I was abrupt I apologise.
You asked a question and you have had a variety of answers. I note that many of the warnings against having a puppy are from people who I know from experience on here are very dedicated and knowledgable owners, such as, for example, Booy, Slubber and Dooin - people whose opinion on these sort of matters is worth listening to. It's not just me who has reservations.
Some of those who argued in your favour are coming from different viewpoints - one has equated warnings against and subsequent ownership of a cat, another spoke up to encourage you saying that she also has gorses etc... but she is already a dog owner and knew what she was letting herself in for and has also doubtless got a form of timetable and practical support as she has horses.
Besides that, I resent the continued implication or assertion on here that any decent rescue would home to a family withn young DC a dog with a history of abuse or mishandling or a dog with no history unless in exceptional and well advised circumstances. This is bollocks! It should be said too that a decent rescue will assess the dogs in their care as well as not rehoming a dog with no or a dubious history to a young family.
Finally, and to return to what I said to start with, you asked if you are being unreasonable to get a dog )and then went on to say you're in fact buying a puppy). You then responded to me in particular with a very defensive tone. This is AIBU - it does not provide only the answers that you want to hear. I speak with perhaps more knowledge of what can happen a few months down the line than anyone here, but you only seem to want to hear those who agree with you.
For the record, I have no issue about dogs with well behaved kids - my babies both came home to a house with dogs in it and grew up with those and other dogs, including many fosters, thereafter. I do worry though about novices taking on a pup with very young children, especially more than one child. and of course will always advocate rescuing over buying, with extremely good reason.