You have no idea what you're talking about.
I wonder if you just made this up.
Low impedance headphones will not "blow up" if connected to a "powerful" setup.
Impedance is important related to the output impedance of the amp.
Low impedance does not mean something is easy to drive.
Google the Apogee Scintilla speaker. It has a 1.2 Ohm impedance. So if low impedance means easy to drive, then how come the Scintilla has a terrible reputation for overheating and literally melting lesser amps?
Impedance has to be considered along with an amp's output power, an amp's output impedance, and the headphone's sensitivity. You take the output power, consider how the output impedance and headphone impedance interact (there is a formula for this) and then you get the amount of power that comes through. Use that resulting power figure with the headphone sensitivity and you can calculate how loud the headphone will get.
If you only have the headphone impedance, you cannot call it a "tough" or "easy" load. That's like saying that x + y + z = n. If x is 3, find z. You can't. There isn't enough information.
When it comes to headphones, you generally want an output impedance lower than the headphone impedance. This is called the "Damping Factor"; look it up if you don't know what it is. Generally speaking, only solid state and output transformer-coupled tube amps have a low output impedance. OTLs have a high output impedance. Do not listen to OTL manufacturers when they say it will drive "anything," that's not true. They will make sound with anything, but an output impedance higher than the headphone impedance loses control of the bass. The only commercial OTL that does low impedance is the Zana Deux, and that's mostly because of its 6C33C tubes. If you don't see 6C33C tubes in an OTL, it probably has a high output impedance.