MyISAM and frm files

Hi there,
So I see the notice here
https://www.percona.com/doc/percona-…k_restore.html

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?

Thanks