I've been a Canon fan since an old sd880 point and shoot. Moved up to a T2i and then T4i. Excellent cameras. I got caught up in the mirrorless craze and about a year ago, canon was behind the competition and i went with a Panasonic gx85. One positive for the gx85: amazing camera stabilization. However, the autofocus for video SUCKS. After a year, i started to notice that a lot, if not most, of the pictures i'd taken years ago, even with the t2i, looked better than the gx85 (i was using the pana 20mm lens). i decided to go back to canon, and even considered the 77d. As i'm reviewing pictures, i am beyond satisfied with the decision to go with the m6. The m6 with the em-f 22m lens is great. sure, i miss the in-body stabilization, and i wish it had 4k video. that's why i give this camera 4 stars (and the picture review takes a second too long). But for results, this camera produces extremely clear photos, and the autofocus in videos blows the panasonic away.
The T#i line is what they call a "pro-sumer" line, which is basically between a consumer line camera like a very basic DSLR and a professional DSLR camera, thus the term "pro-sumer." Typically what this meant is an DSLR with an APS-C sized sensor, decent resolution, and some hand-me-down professional features of pro-grade cameras from a few years ago. For this reason, sometimes it's not worth upgrading from one of these cameras to the next until at least a few generations have past (meaning if you have a T5i, it's not really a giant leap forward to upgrade to a T6i). However, the T7i is somewhat different. When I was doing research on what features it has and what it is missing compared to the pro-grade DSLRs that are considered "current" right now, I was surprised to find very little. The main differences really is that the pro-grade cameras have the LCD display on the top that would display all of your relevant camera settings, and then a few of them would also sport a full-frame sensor. Other than that, the differences are very minor. Something like maybe 1 or 2 frames less in burst mode or something like that. Nothing that would really jump out at you and make you regret not stepping up to the professional grade equivalent (Think it would be the 77D?). It actually has pretty much all of the big features of even their current pro-grade DSLRs, making the T7i probably one of the best prosumer DSLRs to buy. 
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