In my current use of MyISAM the databases are extremely small and kept for a few weeks after which time they are deleted and completely rebuilt with a clean slate. The script uses MYISAM tables and other than lack of support in the latest MYSQL versions, I have never had a problem with the way they work.
Changing to INNODB is something that would be time consuming and provide a zero benefit. However, I am concerned that eventually there may come a time when either the Older MySQL version is not available or some other process forces the move.
My question is: Does anyone know of a specific reason to change from MyISAM to MyinnoDB just to keep up with MySQL.
If I can keep using what works for my own specific use, I see no reason to worry with testing and possible errors when there are more pressing issues that do need attention that have problems now. MyISAM does not have a problem at this time.