It’s difficult. Sometimes it’s necessary to introduce that, since it generally also throws the reader off if they got time to form a picture in their head and you suddenly destroy that and have her large blubbery breasts weigh down on your chest on page 20. Or need to describe her eyes in detail later because they look at each other for a minute. Or in book 2 her sister comes visit her who also has ginger hair… I think that’s the reason why people do it. The less specific you are, the more you have to constantly factor in that all the characters could have vastly different appearances. And later descriptions of scenes have to get even less detailed.
Generally speaking I’m completely with you. Reading stories sparks imagination. And it’s fun to imagine the characters, picture the scenes. It’s not easy to write it that way.
I also don’t mind exaggerated. I’d like to be able to picture myself in that situation, but I have some imagination available. And I know realistic and grounded sex. That’s not what I read literature for.