Chaosmancer
Legend
Sure. And that still tends to be equal or worse than hide+shield that druids get from the get go. (And rogues don't get mage armour, unless they're arcane tricksters that want to waste on of their rare spell slots for one point AC buff.)
Popping in with a "Nope"
Monk is the only class that is limited by Unarmored Defense (the only other example is the Barbarian, who can use armor) and getting a 16 AC is trivial baseline for them, with a 16 Dex and 16 Wis. That is equal to the hide+shield that you are talking about.
I will admit it is harder for Wizards and Sorcerers, but not only can they reach 15 with little to no trouble, the shield spell allows spikes to 20, which is better than Hide+Shield
Rogues are also a bit of a case, as we have discussed. For them to get a 16 AC requires an 18 Dex, which is doable pretty quickly and definitely something they are typically aiming for. They also have some extremely good defensive features, like uncanny dodge, Evasion, and Cunning Action. And that is if they even decide to play melee, when they are equally likely to play ranged, as are wizards and sorcerers and many other casters.
So, pretty much no one is sitting at worse, except maybe some wizards and sorcerers. Who are also the only d6 classes, everyone else is d8 and looking at some good ways to get above that 16.