For the same reason that if an open-source project hasn't had any github commits in a fee months, people on HN call it "abandoned". A new logo signals to people

For the same reason that if an open-source project hasn't had any github commits in a fee months, people on HN call it "abandoned". A new logo signals to people that the company is active, their products are being updated and evolved, and they're not stuck in the past. Imagine if a company reverted back to the logo you remember from your childhood. You'd think they were regressing backward also.