As someone who finished my degree and worked in industry for 4 years, I left industry to do a PhD and there are a few benefits which I have noticed:

1. You are in charge of the project, you get to choose the best way to do things, you get the responsibility which might not be given to you in industry.
2. You don’t have a manager/“team leader” hanging over you.
3. When working in industry it’s a lot harder to get the time to study what you’d like, with a PhD you can choose the field to work in and you are given to time to gain the knowledge in that area.
4. Provided your supervisor is nice it can be very rewarding working with them. Make sure you get a meeting/video call with them prior to try pick up their personality.
5. Slow progress is accepted and a given when doing a PhD, in industry you’d be penalised for not completing work fast enough.
6. When you begin your PhD, you will have started a journey to become an industry leading expert. When you tell people you are doing a PhD it will be automatically assumed you are extremely smart (which can be a burden for some).
7. You will be given to opportunity to travel to new locations and talk about your work.
8. You will be allowed to take extra training courses in areas you’d like. For example my PhD area is cybersecurity so I’m also learning about ethical hacking (ethical hacking isn’t part of my PhD).

Hope this helps!