[Dextro]

The author actually expanded a little bit on that by mentioning he doesn't know of any head units that will come out without plastic tabs breaking.

While you wouldn't fully void your warranty the dealer/manufacturer would be under no obligation to replace parts you broke.

[Moto7451]

My 5th gen Camaro's head unit came out easily (assuming you're not horrified at the idea of removing the center console). There are lots of plastic clips and tabs and a few screws, but nothing broke and it's all reversible. Due to the poor quality of most aftermarket head unit enclosures for my car, I've had to do it more than once.

[walrus01]

In a modern tightly integrated vehicle, taking apart the dash enough to remove the whole integrated head-unit is a real pain in the ass. If you can buy a unit for $200 on ebay and test it on a bench, the author probably considers that to be a good use of their time, nevermind the plastic fasteners.

If I were to try to take apart the dash of my car I'd guess I would be looking at a 6 hour project minimum.

[londons_explore]

Not only that - if the project takes 6 months, your day-to-day car ends up without a head unit for that long...