The R in RPG is there for a reason.
The game needs to provide tools that enhance roleplay.
Being able to name your own class, have a birthsign, name your spells, all enhance roleplay.
You cannot always just imagine things when playing a game, that is lets pretend. Not roleplay.
The removal is upsetting to some people.
Yeah, there are mechanics and features in the game that help you build up a character. In Skyrim we choose a constellation, boost up skills associated with those constellations, carve "perk trees" within those constellations, and then put points into our three existing (Stamina, Health, and Magick) attributes. Those enhanced skills, perks, and attributes then give us the ability to do certain things in the game world we would not otherwise be able to do with lower levels, such as carrying more weight, maximizing weapon damage, learning different moves, learning more powerful spells, etc.
It helps us measure and understand who we are in the game world. It's better to have these things measured out to us in numbers. If it was all under the hood, it would be a little confusing from a current gaming perspective. For example, if I use a certain weapon type long enough I get better at handling that weapon and can maximize it's use and damage. Without a number system, we would need to see and notice that progression happening first hand, but we don't experience and learn those things as if we are actually doing them, we are viewing those things on a monitor without a clear sense of progression.
In 20 years, there may be a more realistic way of viewing and experiencing the use of a weapon in a game. We would need to see and feel as if we are getting better at something without the use of numbers. In reality, when we train with a weapon, we just know through the experience, and that mental/physical progression is difficult to represent visually. Right now we need numbers and menus to help us see where we are in that progression and where we are in that desired archetype. Another way to put it is that our Characters are the ones that are progressing, we ourselves are not, and this number system is a representation of that progression that we can view and understand instantly. We know immediately what our character can and can't do, and can decide on what direction we wish to proceed.