I'm one of the founders at OpenRent (UK rental site [1]), and loved your post. We face this kind of problem daily, and have tools in place to make sure our landlords reply to all tenants - even if it's to provide a reason why they're not suitable.
We're constantly looking at better ways to solve this problem and improve the tenant experience - and your post will prove an excellent bit of anecdotal insight for us. Our data is similar, showing even just a name can impact response rate!
To those suggesting all applicants should provide more data (facebook / linkedin / credit history), it's not always that simple. Still in the UK many renters don't have an online "presence". And whilst that may not be a problem for landlords with "hot" properties, putting off tenants for landlords with little demand is an absolute no go for us - sure, we want applicants to be of a high quality, but just because they don't have that information doesn't mean they aren't suitable.
We think allowing tenants to provide more information, whilst supporting all application levels is key - but making it clear that the more data you provide the higher your chances of success and a quick response (even if it's a simple no) isn't always easy.
[1] - https://www.openrent.co.uk