I've only ever had calls exercised when I chose to do so, all other time I just rolled the position - other than the very rare case of an early assignment, you need to be pretty careless to have your stock forcibly sold
And the ~$600k I've made so far this year in selling calls and puts rather validates the idea, I think
I always look at percentages. It's a lot if $600k is 30% of one's portfolio. But too much work if it's just 3% IMO. Or I could just be lazy