Well the ultra is great but some of what you are saying is not correct.The Samsung Galaxy S23 Ultra is the superior model because it has superior hardware over the Galaxy S23. The S23 Ultra's 6.9-inch screen, improved processor, larger battery, and higher-resolution camera set it apart from its predecessor, the S23. The S Pen stylus, which can be used for writing and sketching, has also been upgraded.
The processor is the same regardless what model of s23 you get. The battery is bigger but so is the screen. The battery is bigger this year on the regular s23 and plus so battery life on all 3 devices is good unlike the s22. The camera system and sPen are exclusive features to the ultra and make it stand out.
But I wouldn't say that the s23 or s23 plus are inferior because they lack some of the features of the s23 ultra. Some people don't like huge phones, and don't care about the s pen or just want to save money.
At least Samsung doesn't use a year old processor in the s23 and s23 plus like Apple is doing with the iPhone 14 and 14 plus vs the Pro models.
I do think for me the s23 ultra is worth the extra cost. It does have more ram in the 512gb and up models, the slightly larger screen with more rectangular shape is much more useful and productive than the models with rounded corners, the s pen can be a life saver in certain situations and the camera system is really great.
Oh and the screen is 6.8" not 6.9".
But let's not have an elitest attitude if you own an ultra. The s23 and s23 plus are also great phones.