For reference, Gibson "Market Master" fridge.
https://www.proxibid.com/Industrial...t-Master-Refrigerator/lotInformation/51831332
https://www.manualslib.com/manual/1155235/Gibson-Market-Master-Series.html?page=20#manual
One doesn't need more than a "token" freezer or any with these all one or other units, that was whole point. IIRC Gibson was first to launch refrigerators without full freezers.
Hospitals, nursing homes, pharmacies, labs, etc... all have fridge only units. They don't need a freezer usually, but do need to keep meds, specimens, etc... cold.
On domestic front these all fridges or freezer set ups were common for households that needed more space in one or other than standard SxS units provided. It was still fairly common back then for families to have a separate chest or otherwise stand alone freezer.
When you think about it, if already have a decent sized stand alone freezer (upright or chest), then there isn't much need for another as part of fridge. Maybe a small one to keep things for easy access next day or something.
Admiral and others did make huge SxS units but how effectively they kept things on each side at proper temps was another story.
Some manufacturers came out with built in SxS units that were two separate fridge/freezer units sharing one cabinet as well. Suppose the modern trend of appliance makers like GE and others with either dual evaporators, or one compressor but using valves to control which side or both receive cooling solves some problems.
