I work for a company and the CTO submits PRs for two projects, and does some QA testing, and helps guide my team's R&D software. It is a medium sided company. F

I work for a company and the CTO submits PRs for two projects, and does some QA testing, and helps guide my team's R&D software. It is a medium sided company. For him it is a chance to lead the future of the company while still writing code and he embraces it fully, albeit he is very busy, but you can tell he gets energized by the way he plays the role. This would not be possible without the right company culture. However as CTO you are probably the best suited person in the company to shift culture toward this, if you wanted.