Updated on Apr 30, 2018
The only downside on the Chrome Preload list is the fact that if you decide to remove your domain from it, you will have to again cover a set of requirements and wait 6-12 weeks to be delisted with additional time for delisting from other browser's lists.
The requirements which you will have to meet are the following:
To address them in order:
You can get delisted from the preload list while still keeping your HSTS enabled. To completely disable HSTS leave only this in your header:
<IfModule mod_headers.c> Header set Strict-Transport-Security "max-age=0" </IfModule>
If for some reason, you cannot comply with the above-mentioned requirements but still wish to remove your domain from the preload list, you can contact the listing authority directly by using this contact email.