Another aspect is bookkeeping. I've had a separate business account (the same one since 1996) to keep all my business transactions separate from my personal transactions. I've been audited several times, and having an account with only business transactions helps.
Plus, there is the enhanced security. Hackers may find your personal account or business account, but not both.
I've been looking for freelance work using LinkedIn. I've recently had three "offers." The first wanted me to facilitate for international Bitcoin transactions. PASS. For the other two, I submitted my name and email. I got a quick email back with a form letter to fill fill out an application form. Was this Phishing? Best to test fates. PASS.