There are many aspects of a secure stake pool operation. The Cardano node itself, operating system, hardware, network and people. Saying you’ll wait for a hacker proof Cardano node is like saying you’ll wait for safe online banking. The online banking is usually very secure and the weakest link are the people using it.
There will also never be a 100% secure pool setup guide. If a hacker knows you’ve followed certain guide, he’ll use it to his advantage and will find the weak spot more easily. That’s why security experts never publish a guide they followed themselves as it would reveal their weak spot.
The more publicity and ADA value the more hackers will target stake pools, exchanges or individuals. Even crypto exchanges are getting hacked and they are employing one of the best security experts. You need to find the balance between what you are protecting, convenience and how much resources to spend to protect it. Securing your stake pool operation should be therefore an ongoing process with continuous learning, improvements and adaptation and there is always a chance you’ll be hacked anyway.