All depends on the type of the certificate you want to get and who will be your CA.

Domain Validation certificates are insecure for quite a few types of security certifications due to how stupid easy it sometimes is to get your subdomain validated through social engineering.

Manager X that manages a small project in subcontractor level can get screwed over way easier than security expert that is managing top level domain of specific corporation.

So there are pros and cons of that solution.