I did run my own email server for 20+ years. As you may imagine, I had to learn a thing or two about DMARC, DKIM and SPF, but spread over the years it is not a big investment to make.
Most of the time, delivery problems were of my own creation. Like running out of disk space or accidentally disabling TLS.
Once in a while, Microsoft would start swallowing emails or Google would push everyone to use DMARC.
But overall, the experience has been very pleasant. I host my mails, I own my data. I am not shy of using Google, but my work is not defined by their whims. When Google tells me I ran out of space in my account I just delete stuff because I have copies of everything outside of Google infrastructure.
Most of the time, delivery problems were of my own creation. Like running out of disk space or accidentally disabling TLS.
Once in a while, Microsoft would start swallowing emails or Google would push everyone to use DMARC.
But overall, the experience has been very pleasant. I host my mails, I own my data. I am not shy of using Google, but my work is not defined by their whims. When Google tells me I ran out of space in my account I just delete stuff because I have copies of everything outside of Google infrastructure.