I think many of the more expensive, older integrated amplifiers have phono stages built in, as that was expected back in those days. Better units from Sony, Denon, Yamaha, as well as Luxman have them.
Best preamp with built in phono stage?
I have and love my Atma-Sphere MP-1 preamp with its excellent built in phono stage. A two box tube unit. I don’t have rack space for a separate phono stage and don’t want another IC. Not to mention the cost of a high end line stage and high end phono stage. The MP-1 was specifically designed to play vinyl. 8 of its 18 tubes are dedicated to the phono. In many ways, it seems to not have competition. Surely, very pricy line stage and phono stage can surpass it but I don’t know another high end pre with built in phono that compares.