When you use code from third parties, you have to spend a lot of time working out how to integrate it and then finessing it to do what you want. In some cases, you may not understand everything that third party software does and it may do some completely undesirable things. In the worst cases, it may do undesirable things of which you never become aware.
9 reasons hand-coding always beats site builders
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As long as third party software are customizable, open-source and have an active community support, then third party software isn’t so bad. The drag-n-drop websites definitely aren’t that customizable. Third party software like WordPress, Joomla, Node.JS, Express.JS, etc. have many people documenting them and sharing documentations about them that a person willing to use third party software to make their job faster or easier just need to take the time to learn how to use them. Essentially, someone needs to know what they’re doing in the first place. However, they don’t have to be the expert on the skills they have.