You’re totally entitled to your opinion but I couldn’t disagree more. Which is fine, it’s ok to disagree.
The last thing I personally want to see in porn is real sex. Most real people aren’t very good at sex, I want to see pornstars fuck like pornstars. I want fantasy sex, to see hot girls doing sexy stuff that your girlfriend doesn’t do. I’m not looking to see a professional porn performer give a half ass blowjob because that’s all the average girl next door can realistically do. The girl next door can’t fuck like a pornstar, true, but the porn fantasy is that the girl next door is secretly super slutty and does want to choke on your dick and get fucked hard.
It’s like watching a musical and saying “normal people can’t sing and dance like that”. It’s true but you turn up to a musical expecting to see a talented singer/dancer. I tune into porn to see a talented sexual performer, to see her do multiple different sex positions, to take big dicks in their holes, to swallow a big dick down her throat, to show me her skills.
I do understand your point that if the performer is playing the part of an ordinary girl, why is she acting like some cock-crazed pornstar during the sex part of the scene. Of course you can vary things and sometimes have a super vanilla intimate gentle girlfriend experience scene as some people want a more true to life experience. You can’t do that all the time though as many others see porn as fantasy, they don’t want run of the mill everyday sex, they want kinky exciting sex, they might want their weird fetishes done on camera. They want the pornstar experience.