Speaker and AVR impedence correlation

This statement:

I read that I should find an AVR with 4 ohm minimum impedence as well

Should probably more accurately be written as:

I read that I should find an AVR with at least 4 ohm impedance, if not a lower 2 ohm impedance.

. Can someone clear this up for me? What is the pro/cons of getting a 4 ohm avr as opposed to a 6/8.

If you had 6, 8 or 16 ohm speakers, then an amplifier capable of 8 ohm impedance would work just fine.
But 4 ohms is < 8 ohms, and therefore, since an 8 ohm amplifier is not rated to drive a 4 ohm load… you are at risk of smoking the AVR.

I just bought the Emotiva T1+ tower speakers, and am looking to find an AVR to pair with it. These are 4 ohm speakers, and doing some brief googling, I read that I should find an AVR with 4 ohm minimum impedence as well. AFter doing some digging on the sub though, I'm seeing a lot of comments saying 6/8 ohm avrs will run fine with a 4 ohm speaker https://mobdro.onl/  

. Can someone clear this up for me? What is the pro/cons of getting a 4 ohm avr as opposed to a 6/8

I got this,..

What is the pro/cons of getting a 4 ohm avr as opposed to a 6/8

You will not void the warranty, and you’ll be less likely to smoke a 4 ohm rated AVR.