@Scott Trench
I think there are a couple reasons assumable loans aren't more popular.
For one, my lender told me banks won't do loan assumptions even if the loans are assumable, but I think they were just blowing smoke so I would get a new loan with them.
I ended up going under contract for a VA loan assumption where the seller doesn't need me to substitute my VA entitlement with his own. They tell me he's 95 years old so I figure he's not buying another primary residence for himself.
To cover the seller's equity I have to put down $75k which will be a 33% down payment on this property. I figure it's worth it for the 2.3% rate. The bank is dragging its feet too so we'll see if it actually works out. All for a fixer upper, that I'll have to move into, that will eventually cash flow a whopping $200 per month for probably a 2% CoC when I move out.
By the time I build my cash back up, all the covid era low rate assumable mortgages will have even more equity and take even more cash.