Fairphone 5 has 5 year warranty. Sure that’s not 4, but the title makes it seem that 4 is longest out there.

Trickier than most. Pretty detailed. I think the island is a nice touch. The ropes are also interesting.

The dolphins!

I have had basically no issues with my setup: Edgerouter 4 (overkill, had a lower end Edgerouter earlier with no issues except the power adapter died, other hardware was fine). Some pretty basic unifi AP. As well as some cheap dumb gigabit switches. Can basically fire and forget them. Relatively easy to do most things I need on it. Never needed a reboot outside of upgrades. No stability issues, unlike basically all other home grade all in one stuff I have experienced in the past.

I could recommend evaluating if you really need shampoo. Look into no-poo or acid rinse. I use local made soap and acid rinse instead of shampoo, works well for me. Other than that as others said we need more info.