Using dma for external incoming mail

Now that dma is the default mta for FreeBSD 14 I'd like to
give it a try. I'm puzzled by the manual page admonition:

"...dma  is	not  intended  as  a  replacement  for	real,  big  MTAs...."

What are the constraints preventing its use for receiving external mail?
It looks as if simply setting it to listen on port 25 will do the job.

The host in question is private, with one real user (me) and four 
email accounts. Total traffic flow is a few messages per day, mostly
from the FreeBSD mailing lists. 

My interest stems in part from the need to occasionally correspond with
gmail users. I find explicit instructions for setting up dma for this
purpose but have yet to find similar instruction for sendmail.

Thanks for reading and any guidance. Descriptions of setting up dma with
similar goals in mind would be very helpful.

bob prohaska