Yes, Canon is supporting 1.6x but they are paying a price for supporting multiple sensor sizes: 1.6, 1.3, FF
Nikon and the rest have essentially stopped making FF lenses - and thus focusing on 1.5x or 2x - but Canon is caught in a bit of a bind: they have most of the high-end market, especially sports photography, and need to cater to that. They have chosen to position FF and 1.3x for that niche, thus they are committed to EF for the moment (e.g. new 16-35/2.8 MK2). However, this conflicts with new lens developments for EF-S - which is the high-volume market (by far): no 50-150/2.8, or 18-200, 17-135, etc. which would all be hot selling lenses. Canon is a large company but even a big firm needs to prioritize their resources.... and all prioritization is a compromise at the end of the day. EF-S is here to stay at least as long as the other formats, but expect Canon to continue to be behind the pace here, or at least until they decide that the EF selection is good enough - then most if not all new lenses will be EF-S. For the time being we may need to rely on the 3rd parties for some lenses (e.g. lenses mentioned above). Or switch to Nikon.
Nikon and the rest have essentially stopped making FF lenses - and thus focusing on 1.5x or 2x - but Canon is caught in a bit of a bind: they have most of the high-end market, especially sports photography, and need to cater to that. They have chosen to position FF and 1.3x for that niche, thus they are committed to EF for the moment (e.g. new 16-35/2.8 MK2). However, this conflicts with new lens developments for EF-S - which is the high-volume market (by far): no 50-150/2.8, or 18-200, 17-135, etc. which would all be hot selling lenses. Canon is a large company but even a big firm needs to prioritize their resources.... and all prioritization is a compromise at the end of the day. EF-S is here to stay at least as long as the other formats, but expect Canon to continue to be behind the pace here, or at least until they decide that the EF selection is good enough - then most if not all new lenses will be EF-S. For the time being we may need to rely on the 3rd parties for some lenses (e.g. lenses mentioned above). Or switch to Nikon.