Yeah, but if itemization grants a skill that defines your build, its related.
You can still decide if you prefer more damage or benefit with synergy builds like in D2 or have more utility instead, depending how your build and playstile fits offering wider customization.
You could for example create a full warcry support barbarian maxing battle orders and shout just to buff your teammates instead of going for damage.
Its your decision if you want to skill grim ward and stuff like find item, search potion, or leap.
Same with other shouts like taunt.
You can definetely activate and use all your spells in your own D2, is it worth it? probably not (because of your specialization), but the choice is yours to do so and the system doesnt prevents you to have a max cap of spells in your hotbar for that reason.
I totally agree, max 6 spells for your hotbar in this modern era is a joke.
In D3 its mandatory, pick 6 spells with a selectable upgrade which is automatically unlocked and nothing else.
Spending skill points by your own decision, creates a build.
Just selecting 6 spells from all your spell pool doesnt create a build, its just selecting what fits you best, locked solely for that one activity.