A fallacy? Well here is the latest NPD switch software sales from last month.
How can you say its a fallacy when the data proves it is not.
My game company knows this and thats why the title we are working on won't be coming to the Switch, just Pc, Ps4,5, Xbox one, Series x/s.
Theres also the fact that porting to switch requires more time than one of the other platforms, if we were also releasing for Xbox 360 and Ps3 then it would be much easier porting but we are not. There wouldn't be enough sales to justify the expense of porting to it.
Some 3rd party games do good or OK on the switch but they are generally exceptions