MyISAM and frm files

Hi there,
So I see the notice here

Because xtrabackup doesn’t copy MyISAM files, .frm files, and the rest of the database, you might need to back those up separately.

Did innobackupex copy these files?
If so, I don’t understand why it is being retired whereas xtrabackup is much more limited without innobackupex.
I don’t see the point of using 2 utilities to backup my datadir.

What is the solution to this?
Is innobackupex or another wrapper coming back to take care of these limitations?