For me, it's about looking after myself and my family in an emergency, not depending on external resources or putting extra pressure on them.
So yes, picking up on global shifts ahead of time is good. It was Covid in Jan 2020, the signs for autumn/winter 2022 are around energy security and rising costs/possibly some scarcity of certain foods.
But it's also about having things ready to cope - when we had lots of pipes burst so water supplies cut off in 2010 with the cold snap, we had large containers of drinking water in the house, and a water butt of rainwater to flush toilets (using a bucket).
People in London had to evacuate their houses at almost no notice due to fires this week - would you have a bag of emergency essentials available or know where to grab overnight clothes, money, meds, id and family heirlooms within 5 minutes?
Do you have an alternative of the main source of something fails? Mains water is 1, or power cut or gas cut off are others. So some backup lighting (candles, solar powered garden lights, torches and batteries..) and a backup source of heating and/or cooking. Heating may be about hunkering down under blankets or might be an open fire and bag of logs. Cooking might be a bbq in garden or a 1 ring camping gas stove.
Just ways to take pressure off while there is a crisis and that you can look after yourself and your immediate family.
Some people also look longer term and have stockpiles of food and other essentials built up over time (a bit now and then not buying the whole lot at once). To reduce the need to go shopping or to manage cash flow or deal with price rises they are expecting.
Some of prepping is also just about having some emergency savings built up so when there's an emergency, you have funds for hotels, higher prices of food/other essentials, can call a man to fix the boiler when it's freezing out etc.
So it all depends on your personal circumstances and what's available to you already, what you think are potential things you may need to deal with and what would help you manage any of those things happened.