What enterprise architecture framework(s) have you formally or informally adopted in your EA org? Do you find it helpful to have your EAs take formal training or certification courses? Have you been able to show tangible benefits and ROI? We are trying to reboot the EA program within our company.

Informal TOGAF is in current adoption phase as I believe EA framework must customize to enterprise ability. 
Formal trainings/certification play a huge role in upskilling internal talent and refreshing concepts to improve credibility for EA.
Our EA Strategy used KPIs to track, measure and report tangible benefits and ROI of EA function before implementation of the practice and tools.

nist cybersecurity framework 

Integrated architecture from user, functional, integration & data to back office is applicable to any design but making everyone follow will maximum our value in company. EA’s are critical to support as you need governance, else it will be out of control and every decision is made by own department. It is not wrong but important to have enterprise architecture to support the company.

TOGAF was informally adopted over the years. EAs can benefit from formal training and certification courses, which provide structured learning and enhance professional credibility.

To demonstrate the tangible benefits and ROI of EA, we’ve tried to track metrics such as improved efficiency, cost savings, reduced duplication, increased agility, increased communication, better decision-making, and improved alignment of IT with business goals.