I once read that Jason Shulman was quoted saying 2:1 is desired.

I know you can get away with ratios just over 1:1 IF you have experience. If you DON'T have experience, that extra thrust is what saves you from damage when you make a mistake.

Extra power gives you that safety margin to get lower (where you can see what you're doing better) and if you want to bail, as long as the plane is pointed upward, you can just jam that throttle stick to the top and watch it rocket to safety. Without that power, you "slide sideways" and have to plan an exit strategy to avoid trees, objects or worse people!

Experts can recognize needs for corrections (I won't call them mistakes) much sooner, and will plan the need to vector the thrust as needed well before an "emergency situation" happens. That's why they can get away with less thrust.

Get a high powered foamie and a flight sim and you'll see what I mean.