It seems to me the other companies are coming out with native ports (sega, atari, capcom, square, etc.).
OTOH how can it be surprising that Nintendo is not cutting the legs off it's own platforms? 25+ years I can't recall their first party titles on anything but Nintendo consoles.
The games are the unique value proposition for their consoles (which they sell for a profit, unlike other companies). Publishing them elsewhere would quite probably be a net negative for Nintendo.
OTOH how can it be surprising that Nintendo is not cutting the legs off it's own platforms? 25+ years I can't recall their first party titles on anything but Nintendo consoles.