100%. I am in the exact same scenario. I thought I'd be able to just plug in the CNAME/A records (super easy) but with this new method I now have to look into how my client's emails will get disrupted etc. A complete nuisance. At the very least there should be the option to do it via the normal process.
I now have a client website that can't go live until I've figured out the consequences of having to use this new method of connecting domains.
Crazy...