This is not an easy one to measure. However, SEO professionals need to be able to analyze data and distinguish between causation and correlation.
A professional SEO can perform keyword research and write content that includes them. Have a look at this article completely for more SEO tasks info.
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This isn't about just writing articles or speaking at conferences.
An SEO must be able to convince clients and internal teams. This can be done through speaking at meetings, writing decks, case studies, and other forms of communication. All of these require speaking and writing skills.
SEO requires confidence as well as the ability to distill complex ideas into concepts that non-SEO people understand and can make decisions with.
There will be much debate over this. It's equally likely that there are many SEO professionals doing amazing work right now, even though they have no programming skills.
Are you experiencing fewer conversions with the same amount of Google Ads spend?
Click fraud could be affecting your ads. You might need to protect your ads against bots and competitors.
These conversations are easier when you have the opportunity to speak with the developer, offer insight and not just make demands.
It is important to determine the effort required and the impact on SEO. SEO pros don't need to know how to code. However, they must understand the coding implications of any changes they request and what this entails to the developers. They also need to know what common errors and objections they might face and how they can be overcome.