Late rent / late fees in Massachusetts?

Question for other Massachusetts landlords. I see that the state laws prohibit landlords from assessing a fee for late rent until 30 days after the rent was due. This seems rather ridiculous to me. But I also understand you can start eviction almost immediately. Since late fees are a key method for training tenants (endorsed by Brandon and Heather in their great book on managing rental properties)--how do you incentivize tenants without the ability to use a late fee? Let's assume it's a tenant who always pays but maybe 3-5 days late. Thanks!