Oh yes tell me about your build that is not totally contagion/bane combo and how it is playing "multiple skills".
-Selfcast Frostbolt+Icenova
-ED/Contagion/Blight/Soulrend
-Desecrate+Cremation/Detonate Dead
-Vortex/Coldsnap builds
-Ignite Fireball/Firetrap/Flamewall builds that apply both an ignite and a burn for more DPS
-Any build that uses an EE or CoH ability like Orb of storms or brands
-Any build using Wave of Conviction to apply Exposure
-Any build using any of the new self-buff skills like Frostshield
-Any build that carries Frostbomb to counter-act life-regen i.e. against metamorphs
-Any build selfcasting EC, RC, Withering step on demand
-Any poison build using Plaguebearer
-Trap-builds generally use multiple types of traps when theres a cooldown involved
-Slams+Warcries to benefit from Exertion
-Archmage builds that self-buff Arcane Cloak
-Indigon builds that active/deactivate auras or totems to quickly gain max efficiency
-Heist spellbuilds that self-buff Anomalous Berserk
-Darkpact builds that arent using your own lifepool
-any of the new steel builds
-any of the new blade builds
-necro builds that apply EE, offerings and a variety of other thigns like deathmark to enemies
This is what I came up with in 5minutes. Need more? The gameplay has become quite a bit more involved and requires people to use multiple skills for full efficiency, and that's certainly a step in the right direction, away from the one-button-one-screen we had ~2-3 years ago. The new gem-system allowing for multiple 6Ls will certainly add more variety to this as well.
You know what for me means playing multiple skills ? Throwing fireball at someone as standard attack and then casting big mana eating spell i can't cast willy nilly on group to slow them down then maybe put firewall between me and them to separate me from them while dealing some damage to slowed down stragglers. Some monsters will try to avoid that some will try to get through.
Which aRPG or Hack'n'slash has been like that? Cause I don't remember one. What you're talking about sounds fun for sure, and I personally enjoy games like these. But they're much more tactical in nature, and there's plenty of games that not only give you the opportunity to do all of this, which PoE also does, but they require you to set up your spells and abilities in this much more strategic fashion to succeed. PoE is in the wrong genre of games if you're looking for that.
I think ultimately you're just playing the wrong game for what you want. There is a lot of games out there that require this much more tactical approach that you seem to enjoy more, but PoE has never had the desire to be like this. You misremember beta PoE if you think the game played like this. It certainly required less button clicks than current PoE does. There was no movement skills besides Leap Slam, which was only usable with specific builds due to its horrendous cast-speed, no applying of debuffs besides self-casting curses, no auras, no multiple-spell-interactions. If you consider this PoE at its best, then you're one of very few people left who think like that. The only good thing about PoE back then was the fact that monsters didn't die as fast, and that can easily be achieved within the current PoE framework without going back to 3-5mobs per pack and rares that took a minute to kill even with the best of single-target builds. Casting Freezing Pulse on a rare for 30second until it finally keeled over wasn't fun.
Maybe PoE just isn't for you, and you're better off playing tactical RPGs instead of action RPGs.