is there anything wrong with Jackery?

There is nothing inherently wrong with Jackery in particular or “power stations” in general. They will perform to spec and as designed. Here’s my copypasta on the topic of power setups:

== begin ==

In general the process is:

• assess daily power requirements <- arithmetic, not guessing
• think critically about charging options, based on your particular use case. Full-timing or long expeditions require more robust field charging than does weekending.
• read and understand relevant specs (not marketing) on everything under consideration
• choose whatever components or all-in-one solutions meet power needs…
  • under the worst conditions you are likely to encounter (winter? bad weather?)
  • at a price (money and effort) you are willing to pay.
• only then break out the credit card

== end ==

IME, anyone who does the legwork will get good results with either approach, whether DIY or a “power station”.

The problem is they are marketed as Magic Solutions to folks who don’t/won’t/can’t do the legwork. “If I just spend a lot of money on it I’m sure it will be fine”. And maybe it will. Often it won’t, because the buyer didn’t know what they needed or what they actually bought. I help owners of power stations frequently over on reddit; such help mainly consists of quoting relevant sections of their own device’s manual to explain why it’s doing what it’s doing.

I understand it can be an onslaught of information at first so I try to help with overviews like: choosing solar panels for your power station.