You can be a good solution engineer but still suck at different aspects of the job. That's because there are too many skills that Solution Engineers need to work on, it's almost impossible to be great at all of them. Even if we break them down, technical skills versus soft skills, there are still many that SEs might not be good at. Examples of soft skills include listening, storytelling, demoing, de-escalating, handling objections, and many more.
It isn't easy to be great at all of them. And yet, even if you're not great at something, it doesn't mean you cannot work on it. It doesn't mean you cannot turn your weakness into a strength. And that is what Evgeni did. He turned his perceived weakness, speaking, into one of his better strengths and used it to get better at building relationships with his customers.
We The Sales Engineers: A Resource for Sales Engineers, by Sales Engineers