Plus most Nintendo consoles HAVE been straight power increases. NES to SNES, then N64 and GameCube. Gameboy, Gameboy Color and GBA. Plus 3DS to Switch Lite, a huge power jump that axed many gimmicks.
NES to SNES -> Shoulder buttons and extra face buttons
to N64 -> Analog stick, rumble and extra buttons
to GC -> Disks, Analog triggers and second stick
to Wii -> Motion controls and extra buttons
to Wii U -> Touch screen, extra buttons and second stick back
to Switch -> Portability, HD rumble, IR camera, tabletop mode and Wii-like motion back
GB to GBA -> Shoulder buttons
to DS -> Touch screen, microphone and extra buttons
to 3DS -> 3D, Circle pad, gyroscope
And I'm probably forgetting a bunch...
They have
always added things to their successor that allowed new experiences beyond what comes from the power bump. Wii and the Switch were outliers because they also cut a lot of the fat of their predecessor and they weren't a big jump in power (depending on which system you're looking at as the Switch predecessor), which led them to laser focus on what the predecessor couldn't do.
People have been blaming the Wii's lack of power on the motion controls and created this hate against any inovation attempt. But the truth is that the Wii wasn't HD because they simply weren't ready for HD development in 2006
nor in 2012, selling hardware at loss or really expensive 3rd party moneyhats. Xbox leveraged their money and pushed competition to fight with the same weapons. Sony was able to fight back, although at great costs, but for Nintendo fighting them with money was the same as filing bankruptcy. They chose to fight with their own strengths (creativity, efficiency and portability), and it paid off.