No intentional restrictions on any version - outside of theoretical limits
Though you will eventually hit a limit on what can be displayed in the left column (think default is like 50) - you can type
$set:domainsrch # in the main search bar at any time to change this for your admin session.
Bug 7667 - Domain node in the left overview pane cannot handle too many subnodes
That won't persist across sessions like if you logout/reload - but you can get someone to stop bugging you by going: "Look, all our email domains but one are missing right now...I'll have to deal with your issue later." -jk
The regular manage domains list view will show them all the domains in pages with "previous < 1-25 of x > next" buttons of course.