Trad climbing is a bucket term that includes all types of removable anchors. As technology has increased, protection like nuts and cams have gotten lighter and stronger, making the barrier to entry lower. It still requires carrying in a lot of extra gear, carefully placing it, and taking care to remove it.

I'll give it a listen on my commute home. It will be a good counter point!

In terms of real harm to the rock, both permanent anchors and removable protection don't do much damage. It's mostly the aesthetics of permanent anchors being kind of ugly.

What is more damaging is the increased traffic to an area once it is bolted. Having to bring your own gear, and take it down afterwards becomes a barrier to entry that keeps wilderness low traffic. If you bolt a wilderness area, you can do things like make it permit only, but at the same time climbers are often known to just not get permits and climb anyways :). Then there is also the question of who's job it becomes to inspect and maintain the bolts. Ultimately, bolts only make sense in areas that are already high traffic, where park rangers are highly involved and safety is a real concern. In my mind, the only reason to bolt wilderness is to turn it into non-wilderness. That's maybe too pessimistic of an outlook, but it's the only way I can read this.