Same thing has been said for Nintendo consoles for years and I'm still not sure what it means.
Its simple really. Developers want machines designed for them. Nintendo does not design their consoles for developers.
From generation to generation developers have a path they follow towards ever more sophisticated game engines and game designs. This necessitates a certain level of performance increase. Developers expect and at times demand consoles to deliver on certain performance metrics from a hardware manufacturer.
In the 32/64 bit age optical media was the future. It allowed larger assets to be stored AND far cheaper prices for publishers having to buy the storage mediums.
Nintendo gave a big middle finger to developers by sticking with very pricey carts
In the 6th generation again, advances in optical storage allowed for larger storage capacity for ever more sophisticated games.
Nintendo gave developers a big middle finger by creating an odd, proprietary optical medium far smaller than a DVD's 4.7GB at the time
Now, each one of these generations saw huge increases in computational ability. Nintendo at the time was keeping up with the Jones'.
In the 7th generation, DVD capacity was enough and like usual there was an expectation of a huge leap in computational ability.
Nintendo gave developers a middle finger by creating an overclocked gamecube. This took the world by storm though and caught developers off guard. But it was still a hassle as it necessitated custom development as their efforts were geared more towards the 360/PS3 in terms of power.
In the 8th generation Blu-Ray tech how now become necessary and all three manufacturers have offered this level of storage capacity. But the computational leap expected by developers is once again not being provided by Nintendo. They don't want to deal with custom porting or content creation. the Wii U is underpowered compared to the Xbone and PS4. They are skipping it and don't give a shit.
Each generation there's always been notable third parties giving Nintendo the finger right back and not developing on their system. Well, it seems now just about everyone is joining in.