As someone who recently converted to using CSS grid for my company, I can't imagine going back. It really reduces the mental overhead when building complex layouts and has made my code shorter and easier to understand.
Who is the target audience of your company? The reason I ask is that I highly doubt I could use CSS grid at my company(news outlet) without breaking the site for many of the users.
Medical practice management software. (we run the medical practices as well) If we made software that was accessible to the general public I would hesitate to only use CSS grid.