I think it's about preventing abuse so you don't lose thousands. 

There may be an abundance of STR-preventing ordinances (or a lack of legit STR managers) in an area that would make following your recommendation difficult.

Have you noticed on BP thread after thread about assorted syndications suspending distributions, going belly up, taking measures to prevent going belly up? 

With a full time job even 15 units gets tough between collecting rent keeping repairs up, preventative maintenance, looking for new deals, managing refinances, etc. 

This "analysis paralysis" can prevent them from acting on opportunities out of fear of making the wrong decision.I’ve experienced this journey myself.

Things to consider: daily internal operations, external branding and operations, lending, in addition to inside out *legal protection and outside in** legal protection, privacy/anonymity/identity protection and security...Prevention measures at different levels, preventing the attack from being initiated vs preventing the attack (lawsuit) being successful vs reducing the damage of a successful attack.... there are many elements and I see people pick one and argue about it without looking at the whole

The word "estoppel" basically means "prevented from saying something different afterwards." 

Zillow won't prevent your marketing, but as others have said, the city might have something to say about it. 

While this hasn't been needed in the past, I’m considering if it could help prevent tenants from reporting problems later that they claim existed when they moved in.

The way my lease reads the tenant remains responsible to pay rent and utilities to "prevent waste of the premesis."