Alice frames are still the standard for airborne forces operations in the USA and Canada. I have tried and own(ed) several eberlestock and mystery ranch options
While the Alice bag is antiquated in SOME design features (Alice webbing, no buckles) the Alice pack remains an excellent option
Bags haven’t changed that much over the years
Look at what some people do to modify theirs. IE “hellcat” Alice packs or tactical tailor “malice” packs
I have used the Alice extensively carrying heavy loads 60-80~ lbs hundreds of KM
Would take it over my eberlestock, TBH - I use a a Gucci TT rhino ruck bag and shoulder straps though