The thing is, and this is the current state of email in general, aka not just google, using an email server other than from [big cloud], like say from my local

The thing is, and this is the current state of email in general, aka not just google, using an email server other than from [big cloud], like say from my local ISP or a large shared hosting provider, you will run into issues. Usually fine, but every few months your (my) server's ip will randomly get blacklisted for a few days, and for a small biz you'll have customers occasionally not receive your email. Random blacklisting maybe is less of an issue if you run your own server with a unique ip only you use, but for most people it's getting harder and harder not to use gmail/outlook/lycos. So ya fuck spammers.