Hi! While the change surely was not a huge investment I just do not believe that the benefits justify the costs. Since you wrote a blog post about it, I felt free to question your decisions.
Nevertheless, now that it is done, I hope the new system works well for you. Maybe your team gets used to git for version control in other areas of work, too, which would be a huge win and ultimately prove me wrong ;-)
I hope it works well too! Maybe I'll write a follow-up blog post in a few months and report back on our progress. In general, I think that marketers today should acquire some basic front-end knowledge and that knowing git and markdown is a good step towards getting there. Coding things like email templates and landing pages without the help of a designer or developer will be huge for us.