By extension, why are the spindle stackers no longer made? You could buy two copies of the record, put one on with A side up, second with B side up, and you can play both sides without getting up. And with each additional record, the tone arm is lifted to maintain correct VTA.
More seriously, there is a reason why automatic TTs are only found near entry level. The vast majority who are into vinyl embrace the inconvenience as a factor of appeal and value SQ higher than convenience. If it is that much of an issue, I suggest to stick to digital library of some sort, maybe CDs.
Additionally, once you get into more obscure vinyl, auto-TTs are more of a hindrance than a help. Say 33 rpm 7" or records with actual sound in runout. I have both.