Would definitely recommend mailgun/sendgrid over gsuite for emails and not entirely agree with this blog post.
I had to switch to gsuite because hubspot doenst allow external smtp server to send out emails and we couldnt use mailgun.
I've had multiple clients in the past who have decided to send "Check out my new App!" emails to their entire contact list from Gmail who shortly found out the hard way that it caused all their emails to start being marked as Spam.
Don't use Gmail like this.
Since hubspot is our CRM I had to start using gsuite. The problem is is that the emails from hubspot land in the inbox. BUT the emails from my outlook that I type it out land in people's spam folder.
One reason why I have zero concerns with googles overarching data privacy issue is that I can see how stupid their AI /algorithms are. And with more noise it just gets worse not better.