Problem is that Samsung is like Apple- a shitton of people just blindly buy the latest Samsung whatever with zero research.
So you have a bunch of other companies trying to stand out in one way or another- Motorola for example just released a phone that brings back the 3.5mm headphone jack. And you have a ton of cheap Chinese companies that may or may not offer any software support after purchase but have interesting form factors.

That makes it hard for the little guys to get the kind of sales volume needed to justify the development and tooling for a really cool flagship phone.

Personally while phones today are far more capable, I think phone designs peaked in the mid 2000s. Mainly because you had actual innovation in design-- wildly different form factors. There were a few phones that flipped open like a laptop with a physical keyboard, a handful that slid open to reveal a blackberry-style keyboard, many had SDIO ports or other ability to clip on expansion modules, etc. Phones had fun features- there was one that could do an early 'google pay' type thing by pulsing a magnetic field to pretend to be a magnetic credit card stripe for a swipe reader. A lot of the early Samsung phones had IR blasters so you could turn TVs on and off. There were a couple designed for gaming that were laid out like a game pad. Manufacturers weren't afraid to experiment and the result was some really cool stuff.

Sadly that's all gone today. HTC (which made many of those cool phones) was driven out of the market by Apple and Samsung, so now virtually all phones are identical flat bricks.
I see a glimmer of hope with flip phones and foldables, but not much. They're all just excuses to