I doubt the glass cannon meta is what GGG intended for PoE 2

I fought the arbiter for the first time a couple of days ago. Had invested quite a bit into my storm weaver spark build and made, what I thought were, a balanced approach to the build with 7k ES with a bunch of recharge rate/speed and 5k mana with 1k mana Regen. But I still got one shotted 10 seconds into the fight when he cast solar storm and I didn't react in time.

After that I decided to respec into a lot more damage. I decided to drop everlasting gaze amu for a +level amu and removed all defence nodes on my tree and invested it all into damage and crit. As a result of that I now beat every end game boss in seconds on any difficulty and the craziest part is that my survivability in maps is actually better as well since I kill things a lot faster.

I thought PoE 2 was gonna be the slower and more methodical game where you're rewarded for making a balanced character. But then they add unmittigatable one shot mechanics to boss fights that forces you into going glass Cannon since defences all of a sudden are useless anyway.

Don't get me wrong, I love this game. But investing in defence feels terrible if they're gonna be useless against boss one shot abilities. I honestly think that unmittigatable one shot mechanics shouldn't be in the game. They're cheap design vise and they force people into playing glass Cannon builds.

Edit: To expand my argument:

In PoE 1 bosses have things that can one shot you like shaper slam and sirus last phase "die" beam. The difference is that we have defensive layers that can mitigate those if we invest in them by losing some offense. We still have glass cannon builds that only focus on killing bosses but as a trade off they often suck at mapping. Therefore it's often beneficial to make a balanced character that are moderately good at everything or having multiple nische characters.

The main problem in PoE 2 atm is that glass cannon builds are just better at everything. Maps are not punishing you enough for not investing in defences as long as you can kill the mobs before they reach you. And since defences doesn't do anything vs end game boss one shots there's really no point in choosing defence over offense in any scenario atm. I still want glass cannon builds to exist for farming bosses but they need a way bigger downside than right now like they have in PoE 1.