It has nothing to do with going green or being a tree hugger or any other horseshit.
Exactly that. It's about resilience, and nothing else.
Nothing wrong with the 100W solar kit from Harbor Freight.
You can certainly get better gear, but it does work as advertised, and the charge controller is RF quiet.
Add some decent batteries, and you're good to go. A Harbor Freight setup with some AGMs is how I got started in solar power for Field Day.
Do note that the supplied charge controller (at least back when I got mine) is only good for lead acid battery chemistry (AGM included in that). If you go with LiFePO4 batteries, you might want to replace the supplied charge controller with one that supports LiFePO4. Bioenno has a decent one that'll do AGM or LiFePO4 that is also RF quiet.