I lost one molar some years ago a few months after the root canal job failed and the tooth just fell to bits. I lost a second on the other side 6 months ago when I opted for an extraction after the tooth broke badly and I couldn't afford the £360 for a crown. It was a difficult extraction and took almost half and hour. Losing the first didn't bother me but losing two can be a bit of a problem for chewing. None of the problems you mention have happened so far.

Generally, I think, us Brits are maybe less concerned with having perfect teeth than in the US so the dentist didn't try to persuade me one way or the other.