the limit imposed here on steemit is not hard set by blockchain but rather by the condenser index of 5. here you can learn more about the storing of the tags (using parent permlink field for storage): https://github.com/steemit/steem/issues/2024

my @roelandp.life account is exclusively used for @steepshot posts, iaw this post was made on steepshot whom have a GUI limit of 10 tags.