Loving all these unreasoned 'con' arguments...
A few more positive points I can see....
No tug delays (which can be fairly common depending on your airport), especially when you're running off schedule.
On days of bad slot delays, there's no need for a tug team to be sat underneith your nose (which generally isn't granted anyway as the team will be required elsewhere), all you'll need for departure is a banksman.
Savings in ground handling costs as you aren't paying handling agent 'pushback' fees