The physical aspect has never been quite so important to me on a personal level but I think that's sort of how I grew up-- much in the same way that I'm fine with having 300 games on Steam rather than 300 "collectible" physical copies of games. When I was a tiny tyke in the mid-80s everything was copied. Dozens and dozens of games copied onto nondescript floppy disks. Dozens and dozens of cartoons taped onto blank VHS tapes. Mishmashes of songs recorded onto a cassette tape. I just never formed the attachment to "the packaging" that I think other people did, and that's probably why I have no real issues with collecting books on an e-reader.

That said ultimately I don't prefer one format over the other. I still buy physical books too if I happen to see one I want. I guess I just don't have a preference.