sorry, I have to object to that statement. Slower aperture lenses do NOT "run counter to high IQ". All they do, is limit the envelope of possible use cases, but not IQ.
For example, Canon EF 70-200/4 or EF 24-70/4 in real life use deliver IQ on par with the respective f/2.8 version lenses, difference really is just "1 stop slower". This is primarily relevant when 1) capturing MOVING SUBJECTS IN LIMITED LIGHT(ING) CONDITIONS or 2) when MAXIMUM SUBJECT ISOLATION/creamy bokeh is desired. Yes, these use cases may be very important or even crucial to some users [small minority] and totally irrelevant to most others. It is always nice to have faster glass, no doubt, but many times "moderately fast" glass will more than suffice and get you images with top-notch IQ. Not to mention, that a large percentage of images captured is taken with lenses stopped down from max aperture.
Most users would and hopefully will
be very well served by compact, light, affordable FF lenses with IQ comparable to "moderately fast" Canon lenses like EF-M 22/2.0 or EF-M 28/3.5 or EF 35/2.0 IS or even the incredible bargain EF 40/2.8 pancake.