Any downside in turning on PHP-FPM for domains that do not use PHP?

I just upgraded my server to CENTOS 7 and as part of that process I set each of my domains to use PHP 7.3 and deleted the earlier versions of PHP. The next issue is deciding whether to turn on PHP-FPM for all of my domains or only the domains that actually have PHP activity. The domains I have can be grouped as follows. 2 parked domains (no activity) 3 domains that only serve web pages and pdf files 2 domains that serve PHP scripts, web pages and various file formats (pdf, txt, jpg, etc) Is there any downside to turning PHP-FPM on for all of my domains? Since the above reference indicates that PHP-FPM will be "on" by default for all new installations of cPanel/WHM, that seems to imply there is no downside to turning on PHP-FPM for domains that do not do any PHP. Can anyone confirm/deny?

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