I don't think it is weird at all as I do the same.
I have:
1) Millennium Star Atlas
2) Great Atlas of the Sky by Byrch
3) Herald Bobroff Astroatlas
Next up will hopefully be the field edition of the Interstellarium Deep Sky Atlas. It looks fantastic.
All atlases listed above have seen extensive use outdoors. The MSA gets its own table and is covered by a beach towel when not being used for star hopping. Same with the Byrch atlas.
My wife gives me a hard time as she doesn't see the point of getting more atlases but she's not really into astronomy anyway. I'll keep collecting them. I can't explain it but there is something really special about the look and feel of a high quality star atlas. The day I got the MSA I read it for about 4 hours solid (plane from Sydney to Perth).
I've never used celestial software so can't compare its use to that of an atlas.
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