I have bought lots of digital photography equipment over the past 20 years. I began with Kodak and Fuji digital P&S cameras, to now having a number of Canon DSLRs, an M5 with lots of EF, EF-S and EF-M lenses and accessories. Two of my most used cameras are my 80D and M5.
I am sharing my experience with you - here, in that Canon's APS-C mirrorless cameras (e.g. the M5) are quite different in use to a APS-C DSLR (despite e.g. M5 and 80D having similar sensors). While DPAF (dual pixel auto focus) is great in many ways (e.g. in decent light it's extremely accurate and fairly quick). But in dim light autofocus reaches limitations, especially with 'slow' glass (i.e. slower than f/2.8). The M5 is not as responsive as the 80D in terms of shot to shot use, AF tracking. The playback and menu system are slower on the M5 too. In bright light, I much prefer the OVF (optical view finder) of the 80D. But in dim light the M5's view finder can be really helpful.
I have used the EOS R (FF mirrorless) - and it's EVF (electronic view finder) is notably better than the M5's (bigger, brighter and more accurate colours and in representing dynamic range). The M5 with medium to large sized adapted EF lenses (e.g. my 70-300mm L or even my 100mm L) soon feels uncomfortable to hold for long periods compared to my 80D.
Where the M5 shines is: having a smaller, lighter and more portable travel camera. It's great to be less intrusive for casual and street photography too. The Canon EF-M lenses I own are all handy in their own right. These are the: 22mm f/2, 15-45mm and 18-150mm - with all working well for different purposes. I also have the Samyang/Rokinon 12mm f/2, which is GREAT for astrophotography.
But If I would need to limit myself to 1 camera, I would choose my 80D (which often pairs with the very versatile 15-85mm for general purpose and travel). Or for ultra wide angle, the Sigma 8-16mm, for macro the 100mmL, for portraits the 50mm (or 100mmL) and for telephoto, the 70-300mm L. I will keep a close eye on the M5mkII, but at this stage, will also keep a DSLR or 2 - because they complement the mirrorless offerings. Hence the 90D is interesting for me from a future proofing perspective.
Meanwhile, I will also be tempted to move to the EOS RF mount FF mirrorless in the future, when a more responsive body is available, and hopefully one which has IBIS. The 24-240mm looks like a decent travel lens, and I hope its optical quality is fairly decent for a 'super zoom'. Will be interesting to see.
PJ