These questions can always bring out interesting opinions.
I had always "wanted" an SLR, and could finally afford one when digital started taking over in a big way, was only really good at the high end, and old film SLRs were inexpensive. At the time, I was in an "only Canon, nothing else" mindset, and ended up eventually building a nice FD mount(manual focus) kit that I felt like I learned to use decently well. I also developed some other pretty harsh stances then like "Just say no to zoom lenses."
Fast forward 10 years, and I still love playing with old cameras, shooting film, etc but REALLY GOOD DSLRs became affordable. Around that time, someone gave me some really nice Nikon stuff to play with(an F3, which is a camera I've actually grown to despise

plus some really good lenses). I expanded out a bit more, and the next thing I knew I had basically rebuilt my manual focus Canon kit in the Nikon system(still missing one old favorite-a 135mm f/2) plus complemented it with a bunch of other stuff. I also revised my hard-line no zoom stance when I realized that most modern zooms were better than the old primes I held in such high regard-the only thing they loose is often 1-2 stops of speed, but then I've also found that fast glass is almost dangerous with digital because you realize how little DOF you actually have. Nikon makes the most sense for me to integrate both together into one system(I can have an F2AS and D810 sitting in my bag next to each other, and with the right lens selection to go along can use the same lenses on both cameras without any loss in capability).
Along the way, I've dabbled in almost every make of SLR, and also owned quite a few medium format(film) SLRs. I've paired down, and aside from some Mamiya RB67 stuff that is spoken for but I still haven't been paid for, I've paired down to two systems-my Hasselbad V system stuff and a Pentax 67.
First of all, the single most important variable with a good photograph-whether with a box brownie or a digital Hasselblad-is "the nut behind the shutter." Learn composition, framing, lighting, and the like and you can get compelling results with anything. Good equipment allows you to do some things better with lesser cameras or does a better job of getting out of your way, but at the end of the day if you don't know what you're doing nothing is going to help you.
Lower end DSLRs(and film SLRs) often offer both a simple "auto" mode and a variety of "scene" modes. Folks who never move their camera out of those really only get the benefit of slightly better DSLR autofocus(which is not superb at the low end), somewhat less shutter lag, "real time" viewing, and an ability to change lenses that often is never utilized. Move up the food chain a bit and all of these variables get better, but somewhere or another the full auto modes drop out and you're left with a camera that makes you actually understand what's going on and probably worse results if you don't understand that. Sorry to be a snob, but I've seen some unmitigated junk turned out by people using a Nikon D850 with a 24-70mm f/2.8E VR(about $5K worth of camera and lens) because of that, while I've seen amazing smart phone work like the above.
With people shopping for a DSLR, I usually suggest going to a store that has a selection on display(even Best Buy is decent about this, but a real camera store is best) and seeing both what fits your hand best and also what starting kit makes the most sense. Someone who THINKS they want a Canon may find that they "take" to how a Nikon handles, or vice-versa, and trying out in a store lets you find this out before making an expensive investment.
At the end of the day, though, just pay attention and learn how to put together a good composition!