IMO, the whole thing is horses for courses.
Essentially we used to have different film formats with different lens ragnes for each, and really, the sam rules apply.
In the end it is about maximum noiseless/grainless magnification, and in both cases they can be used artistically.
As to shallow DoF, even that is possible with digital these days, unlike in film days: with adapters like the MetaBones Speed adapters you can actually create really shallow DoF by using large aperture FF klenses, no problem. Just that the advantages of smaller digital formats disappear in that case, as the lenses are as heavy
. However, if you do have a few lenses liek that in your line-up, it is very convenient.
Another interesting point of discussion is of course EVF vs OVF, and electronic vs electromechanical shutter. At the moment it really is a choice when it comes to certain types of photography: action, sports and relatively fast moving subjects still require OVF/electromechinal shutters, but the days are nearign when this no longer is an issue. And generlly speaking, the latets incarnations of EVFs are really very good with their high resolution, all kinds of useful focusing aids, and even the option to make the image in the EVF look like the environment, from a brightness POV.
In short, use a specific type of system for a specific use you may have, like you already do with lenses etc. Personally I like MFT for its size, weight and options when travelling light. Since I do not do any sports etc. photography, the systems are almost interchangeable for me. IQ-wise, MFT is way better than my first DSLR for sure, a Canon 350D, and I used to make 90cm x 60 cm enlagements from the images regardless, with some careful shooting and processing. With more end better IQ this is easier with modern systems anyway.
Do also note that for average websites, 2 MP images are already overkill, thus giving plenty of leeway for any defects perceived at pixel-peeping levels, considering modern sensor MP-sizes.
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....