It's interesting how relative people's experience can be: for me, it was the opposite, as I feel that Arch has let me save a lot of time. I was using Gentoo at the time I decided to switch to Arch, and the relatively deeper understanding of the internals of the OS that is necessary to keep a stable Gentoo system made Arch feel like a very well-designed Lego toy. I guess that LFS people coming to Gentoo would feel the same :)

TLDR: I love Arch, I feel that I don't lose time on it because I made the switch from Gentoo.