What’s the most frustrating part of managing existing WordPress sites?

Anyone else feel like modern WordPress work is mostly maintaining existing sites now?

Most projects I work on aren’t “build from scratch” anymore.

It’s usually:

• fixing WooCommerce issues
• updating existing client sites
• testing plugin/theme changes
• debugging conflicts
• trying to deploy safely without breaking production

We kept hitting this problem repeatedly while working on WordPress projects, especially with client sites.

Curious how other developers/agencies are handling these workflows right now?