Warranty preference can be an interesting discussion.
I'd prefer to save the money up front & DIY later if ever needed. I have the basic skills needed but I realize lot's of people can't or simply don't want to DIY. A long warranty would be comforting to them.
Warranty length or coverage would be further down my list than most folks I think. I buy used also so warranty is hardly a thought.
My van was cobbled together from some parts previously used in another van by the original owner/builder.
The fridge is from 1994. Works great.
One solar panel from 1994.
Microwave oven owner manual has 12/91 on it.
Water pump replaced once in 18 years.
The charger receipt shows 1978 - I decided to upgrade that!
The stove is early 1990's for sure.
The furnace would be late 1990's.
I replace the water heater - I think water was allowed to freeze in the original water heater after the owner passed away. The tank had distorted.
Any money spent on long warranties on those item would have been wasted in this case.
I did have a newer inverter replaced under warranty. That was just take the inverter back to the store and they handed me a new one.
I had two items to be dealt with under warranty on a newly purchased used coach. The dealer screwed up both. One was fairly minor to correct by me - Onan 4kw gen float bowl reinstall after they somehow managed to twist the wires so much that they looked like twist ties. The other was fairly major as I had to drop and dismantle the propane tank and replace parts. The dealer broke off the float in the tank and couldn't find a replacement after 30 days trying. I pulled the coach from them, located the part with one phone call and had it by the end of the week.
You can see how my experience forms my opinion on this subject