Technically this can even be correct. You can build and operate a good, secure solution for yourself if you have time and skill to build. Could make sense for a company handling sensitive data. Would hardly make sense for most individuals who are not professional SREs / SWEs. (To check how it feels, an engineer can try to sew themself a pair of pants to wear daily, or do something similarly mundane in what they are not skilled.)
A solution that can reliably work for non-experts is very important.