Maxperson
Morkus from Orkus
I disagree on all 4. Spells are not what I think of for any of those classes when people ask me about them.Welcome to the ranger, warlock, sorcerer, and cleric. Half of those classes was defined by their exclusive spells due to either the weakness of their class feature mechanics and/or the sheer power of their exclusive spells. The edges of the clases have started to meld into each other.
Not once has someone asked me about a ranger and been told, yeah they have ranger spells. I describe the tracker and woodsman(all terrain really). I tell them about their ability to fight certain foes that they choose. And so on. Same with the rest. I describe the actual class, not the spells that don't have anything to do with defining the class itself.
From day one, none of the 5e classes felt the same to me.It really took Tasha's optional class feature variants/expansions and powered up subclasses to keep many of the classes from feeling the same. However it doesn't seem like preservation of class identity was focused on actively and more of an aftereffect of the search for interesting subclasses (subclasses the dip into the play styles of other classes themselves).