At this stage, all digital cameras (DSLR, mirrorless, smartphone) are, in terms of technical image quality, more than sufficient for the average person; especially those who basically take snapshots. If your iPhone from four years back took great photos then, it still takes great phots now.
And really, if you need to do a side-by-side comparison to reveal slight differences in technical quality, then does it really matter? Actually, how much does technical perfection matter in the overall photographic canon? Not as much as lots of folks are lead to believe.
I’m not dropping the relevance of image quality from 100 to 0, but there are a number of points in-between that different people will find aesthetically acceptable, particularly when more important matters are considered, such as lighting, composition, geometry, tonality, contrast, movement, or subject matter.
Robert Frank’s “The Americans” is technically messy, but I’ve never encountered a greater photographic essay (maybe there's one that I just haven't seen yet, but until then...).
But yeah, I get it; some folks, particularly those whose livelihood depends on photography, need the latest and most advanced to not just best facilitate their style but to also do so in the most efficient and reliable manner.
Then again, I also know that I’ve seen some recent pinhole photographs that are as visually engaging as any other shots that have crossed my eyeballs. Sure, it’s all a bit subjective, but that’s OK…it’s why choice remains important. Use what you want, use what you need.
Finally, irrespective of what camera you are using, don’t underestimate the value of post processing; it’s been an essential element of photography since the medium’s inception.