Not every texture pack labeled "HD" or "4K" uses PBR. Look for these maps in the file list:
If you only see one file (a .jpg or .png), it’s not PBR.
Here is why creators and gamers agree that PBR is the superior standard: pbrskindsf better
Performance & Reliability
Features & Roadmap
Quality & Documentation
Data & Analytics
Security & Compliance
Marketing & Growth
Support & Operations