Depends where you are. In my house in Chicago next to some high rises I could see 200-300 access points. My own fully powered 802.11ac access point had a range of about 12 feet. Worked for some rooms, but not for others. And the signal was jumpy. Was super nice to have a hardwire at my desk so I could go full speed.

> what are the most common reasons to still prefer Ethernet port?

Attempting to provide wireless coverage for a densely populated open office gets pretty expensive pretty quickly. It also can cause degraded signals for everyone in the office. The ethernet port just becomes more feasable way to get stable internet at your desk.

reliable network, consistent (low) latency and the security aspect. At least that is my top 3.