I agree if you can afford a house in SD, your time is probably more valuable than DIY labor.
That is the case for me, but I found fencing to be kind of relaxing and idiot proof work that was fun to do with family.
The plumbing work you all were talking about earlier seemed more stressful. But the main work of a fence is hauling lumber, painting, and driving screws. So good exercise where you can turn your brain 75% off after a day sitting behind a desk.
I only replaced my non-shared fences actually. My neighbors are too cheap to pay for half of a fence replacement even though they are termite damaged and partly rotted. I also do not want to argue with them about design. A few parts that were very bad I just paid for myself, but I won’t do it all at my expense.