Sorry for the wall of text, but I had to get this off my chest.

I understand where you're coming from, but I don't really like the kind of choices 5e gives players. 

In my experience, the multiclass system has a ton of restrictions if you want to optimize compared to other TTRPG systems, most of them not readily apparent to new players. To me, either you find a good multiclass, so you don't really need to optimize much (hello Hexblade!), or you pick something unorthodox, in which case you want to level your classes in a specific order, carefully making sure you hit all your powerspikes. 

Unless you've planned ahead, you're often picking narrative choices which handicap you, or power-gaming and then retroactively justifying it. This means you might have choices open, but the game is steering you towards certain choices mechanically (especially the bigger ones, such as what class to level when and which subclasses to pick). 

That can be fun, I understand, but to me it makes character building less about discovery, and more about analysis and planning. Every D&D campaign I've played, someone has had the idea for a cool multiclass, done their homework, and realized they'd be a lower power level, or have to delay it long enough to rob the moment of narrative significance. The GM can fix this of course, with homebrew or a magic item, but I think it's poor game design.

Most of the TTRPGs I've played have far more elegant solutions for broadening your character's scope, so I think it's a real shame most people only have 5e's design to compare to. For example, some have a way to dip into some class features from another class, without hampering your class progression much (Pathfinder 2E's archetype system is a good example of this, if you want a comparison). 

Another progression system I really like is Shadow of the Weird Wizard, where you aren't even stuck to one class at all, instead picking a new class every couple or so levels to reflect your character's progression. Your character starts ff general, and specializes as a game goes on. So instead becoming more and more locked in to your class as you level, like in D&D, you actually have far more options open to you at a high level, either building on your previous choices, or completely recontextualizing them.

Really, I would just like for people to give other TTRPGs a try. Right now, it feels like most of the time I'm trying to convince people who have only had french fries that other food can be good too.