If you are stuck, and only have one hammer to use, then you'll probably appreciate having it. Given a choice, many of us have multiple sized hammers around though.
Same with generators. Compact suitcase gens are very popular - easy to move, relatively quiet, and easy on fuel - so they fit a lot of short-term needs. Step up to 5kw or so, and you can run most household essentials in a longer outage.
Needs vs. Wants...... hard to beat the
convenience of a whole-house auto xfer system - esp. if on natgas or propane to get away from fuel stability issues. If I still traveled on business (aka still made the same money....) like I used to, I'd probably have have an auto-xfer system in place here by now.....
Some people on here have
major agricultural systems (water, heat, ventilation, dairy herds, blast freezers, manure pumps.....) to keep powered - they
Need to have a high capacity generator in place - either dedicated/pre-wired, or at least a high-capacity PTO gen available quickly.....
You can't break large granite rocks with a tack hammer.....
Many times in a household outage, all that needs to be run is a cell charger, table radio, or laptop+router for communication needs...... there's where I like an inverter+battery..... You don't need a 2kw gen running constantly for those kind of light loads.
All systems take money, planning, and maintenance..... specifics vary....... when pressed in an emergency, even today's all-thumbs average consumer could probably manage to unbolt 2 cables, and connect a new/fresh battery, perhaps even getting the polarity correct
I wouldn't make the same bet, with anything involving carburator issues.....
(Re. thread title: 2kw Briggs, 7kw Briggs - continuous power rating, both gasoline).
Rgds, D.