Wordpress plugins where if you want to modify them and the update is applied it overides... Sifting through plugins to find what you want to update, having to go through lots of plugins installing them and removing them till you find one that works... All the plugins out their sniffing user data, credit card info in some shops that can not and are not policed and people do not know about.... Open source thing that is constantly being hacked or people keep looking for ways to hack sites and when they do they can hack many sites all in one go.
If you want to have good customer relations and manage your clients you will have to have good servers, maintain them, support your clients with them, update the wordpress sites all on your own properly.. If you have any custom things all the testing etc you need to do... (Other stuff like security certificates etc)
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