i don't disagree, and i have a nice stable of variable power scopes to prove it. i love every one of my scopes and wouldn't trade them for anything. that said, it is very, very hard to beat an aimpoint t2 or an eotech standalone rds for sheer light weight and speed of target acquisition (for me). having a removable magnifier capable of reaching way beyond typical rds range is a huge added bonus. obsolete? meh i don't think so. aimpoint glass is up there with the best optics i own imo, and it's doubled as a nice spotting scope on occasion to boot in addition to giving me serious versatility
also, speaking of costs, idk what everyone else has as far as preferences, but i subscribe to the old adage, "strong, light, cheap. pick two". hence, my optics are...not cheap. the initial cost of the 6x magnifier is steep, but it's a buy once, cry once philosophy. that magnifier is now interchangeable on any rds i have or will have for the rest of my life. atm it's mated to an aimpoint t2, but as i mentioned, i'm close to pulling the trigger on an eotech exps 3-2. after discounts and rebates, i'm looking at $478 and change. 6x mag is a sunk cost, so i have a light, rugged 1-6 holo optic for $478 is the way i see it. can't even come close to beating that with a scope. if/when i build another rifle and want a trijicon mro, a 1-6 rds optic on that will be $450 and change. for comparison, my nightforce 1-4 nxs was $1300, and weighs the same as the rds/mag setup. a vortex 1-6x weighs 8oz more and costs the same
anyway, just get all of the optics. it's the only way to be sure. rds, magnifier, fixed optic, variable optic, all. you'll never run out of rifles to put them on, and you'll have a LOT of fun shooting them and comparing strengths/weaknesses. after all, it's only money