Another way you can look at it is that when you start off learning to fly, any radio will suffice.
When it does come important is when you decide to step up to buy a new radio, you need to see where your interest is going. Say your goal is to fly large scale in the future. Did you know in some setups it requires 9 servos? I also wanted 5 modes of flight. Then some mixes. See what I mean?
Another was in a scale transport, where 1 engine starts, waits 5 sec, and then the second starts (automated), then gives you control to fly it. I programmed another sequencer so that it has a brake(3 modes) so it was locked at startup, to taxi, it was a sequencer that oscillated the brake on and off so when throttle was advanced it would have a constant speed and when ready to takeoff, brake on, run engines up for takeoff, then release brake.
How about a gun turret rotating ? Sequencers do that.
For many, a 6-7 channel is good with some mixing fits the bill. Just research what your intent is.(number of channels, mixes, fly helis, etc)
Then find the radios that offer those needs and choose what fits you.