We tend more toward a middle aged / older crowd. Lighting is important, and a single EON just won't cut it, but would come close... We try to put as much as we can into the PA, if it were just for vocals, the PA would be a bit simpler.... My XENYX 1202FX passive mixer into the Harbinger V2112s. Done... Probably get by with only one.
And again, that's all part of the math each musician, and band must do about gear. What works for you, and your situation, won't always be appropriate for everyone, or every situation...
When we started, we had a pair of Alto powered 15s that had to get sold to raise some quick cash, and very minimal lighting. And just the small mixer. We didn't mic any amps, or line them into the PA like we do now with the guitars. And it worked, and required a LOT less schlep. Now if we for a second assume let's say just every member bring their own mic, cables and stands. Then the schlep would be.
Bass player. Combo amp, pedal, instrument, mic, stand, XLR cable. And since I own it, the XENYX 1202FX mixer, and V2112 speaker and one stand. Already too much stuff to get on a bus... At least here. They won't allow it.
Lead Guitarist. Combo amp, padal, 2 guitars, guitar stands, mic, stand, XLR cable. Some of the lighting kit.
Rhthymn guitarist. Combo amp, 2 guitars, guitar stands, mic, stand, XLR cable. Some of the lighting kit.
Drummer. Drum kit, cymbals, throne, mic, stand, XLR cable.
For public transit, at least where I am, dragging a 12" powered PA speaker, stand, and a 2x10 combo amp onto a bus is a non starter. Assuming I don't get mugged for my gear, it's just too big, and the bus driver WILL have a problem with it... Same goes for my guitarists Champion 100, and we aren't even going to talk about the drum kit...
Now again, downsizing can work though. A single Alto 10" powered speaker for vox, a Rumble 100 which is considerably smaller than the 500 for me, and a Champion 40 for the lead guitarists mostly solves the issues, but not really, and the size and types of shows we can do get a whole lot more restricted....
What a lot of it boils down to is this. If the venue provides a quality backline, I don't need to bring and hassle with schlepping all that gear. Those venues are very, and I mean VERY few, and extremely far between around here... Especially for the types of gigs a band made up of 40 - 50 somethings that have day jobs and play mostly for the fun of playing can get...