At first glance this sounds great because the AI feels like it was made specifically for that business but then the more important features and instructions you customize to it, the more things you have to look out for especially during an update. Another reason this might prove tasking is that SaaS companies are constantly upgrading and when that happens customers change, documentation changes, AI models get updated, product features change and even business rules changes and every customization has to keep working through these changes so something that works now might need to be fixed six months later.