In reply to Greg Schoppe.

Thanks Greg, that is a useful plugin. I have some 50 or more websites build for clients in the past, build with custom themes and plugins. Probably most of them will break if/once Gutenberg is introduced. Those clients for the most part will not be able or don't want to pay a developer to rebuild/fix their website. The best thing I can offer is make sure their websites work as they are as long as possible, without Gutenberg.