You've clearly never rented a property recently then.
In some places, even viewings are insanely difficult to get, with EAs only having a limited number of viewing slots at a specific time. No other options available. Once they're gone, they're gone. They know that they'll get several of the viewees wanting to rent it, so don't need to waste their time with more viewings. Once you've viewed, the EA puts forward "suitable" people for the LL to chose.
My son was a professional tenant, good income, provable earnings (contract of employment, payslips, etc), but struggled to even get viewings. When he finally got a viewing, he was so desperate, he offered a years' rent upfront and 10% over asking price! It was the only way to get one!
A couple of years later, perfect reference from landlord, etc., same story again, took six months to get an "offer" accepted on a rental.
I've no doubt that some places are different to others, but this wasn't a big popular city and he was only looking at small 1 bed flats, no pets, etc. Trouble was it was a bit of a "historic" small city and a huge number of smaller properties were lost to holiday rentals and Air BNBs!
It's absolutely insane out there in some places. The old fashioned ideas of the only people struggling being unemployed, pet owners, or self employed are long gone - it's far worse now, with demand so high that even people with immaculate credit histories, references and work/payslips struggle to be accepted too!