Not a good idea.
When we deliver a website, it is technically up to date and running as a matter of course. Even if unexpected errors should occur later, which can never be ruled out with technically complex websites, these will, of course, be corrected by us within the usual warranty periods.
However, the Web continues to evolve at a rapid pace. The times when a website is developed once like a brochure and the web project is completed afterwards are also over in technical terms. Updates for content management systems, for example, come almost weekly, and among them may be components important for the security and stability of the system.
If website software is not kept up to date, hacking is only a matter of time, often with consequences for the company's reputation, sales, operational processes. And usually also means a breach of the GDPR obligation that should not be underestimated.
Also, it is easier and cheaper for the web team to develop the website if the technical structure of the website is up to date and 100% known to us.
Think of maintenance as an investment in the long-term value of your intricately built website.