It seems only auctioneers have replied so far
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You raise valid points. It appears people are naively buying sight unseen, which is absolute madness and there are going to be serious consequences for many people when they get possession. You've only got to look at online auction results to see the number of sales.
I saw an online group discussion about a forthcoming auction property with a shared access. A new contributor, who seemed to have been tipped off about the discussion, told the OP there was no access included in the sale as he owned it and would be blocking it off.
The property formerly belonged to him, had been repossessed and he was determined to get it back.
In theory there should be no property sales happening but they are with people either chancing visits or just buying blind.