It can be very disruptive in mult-family to have showings and I fully understand why a seller would put this restriction in place. 

Remember when, as an agent, gurus would come to town and disrupt the markets with all kinds of stuff.

Landlord will promptly respond to Tenant request for repairs but will not be monetarily responsible for tenant disruptions or inconveniences during habitable times of repairs or tenant/guest injuries incurred in or around obvious areas of maintenance, repairs, or construction.

Won't be as big a disruption for sellers as most think. https://www.dnainfo.com/new-york/20160725/bushwick/l-train-shutdown-heres-how-commute-between-brooklyn-manhattan

A flip is extremely difficult to live in, it is messy and disruptive.

Also in the area, but can be applied to other markets as well, there are pending layoffs/furloughs from top 10 large employers that may disrupt the market. 

Usually they don't want hoards of people disrupting their tenants.

You can't try to suppress a disruptive technology but eventually it will become too big.  

But beware of dismissing something that's disruptive to your business too quickly.

Meanwhile my background in real estate has been primarily that of consulting thru education; helping via research to bring back many of the facets that was disrupted by the 2008 financial crisis whose impact was felt hard in real estate.