It makes zero sense to say we had “all the solar, wind and renewable energy we have now”. Electricity wasn’t discovered until 500 years ago and made useful much more recently, in the early 1800s.
Sure we had windmills and watermills, but surely anyone can see that harnessing the power of the wind or water for a dedicated task is a very different proposition to generating energy that can be directed to nearly anything.
Renewables can’t replace fossil fuels everywhere they are used, but they can directly in an awful lot of cases and more cases can be adapted to use electricity rather than fossil fuel (trains going from diesel to electric, etc.)
So more to the point, what are you on about?







It’s really about balance and what you hope you to get out of it (easier to set up again next time? less fragile setup? learning?).
A mitre saw is more dangerous than a handsaw and requires you to learn to use it properly and safely. It also enables you to do more and faster. It’s a tradeoff :)