For me, even software running on devices can make the device "content" or "unhappy". It's like the software is in line with how the silicon wants to be. Its not design, it's something deeper. Like a kind of flow state for bits.

One large scale example could be linux vs windows on a server. Linux seems to be more attuned to how the system wants to run. With reflection this might be me combining anthropomorphising and my own prejudices and likes and biases with a projection of my personality onto the software.

But I remember certain Windows applications felt they run better than others - even ones with worse design or that were proprietary. With more consideration this might be when computers had visual blinking LEDs and audible HD clicks and subliminal capacitor whine. If that's the case then in my feeling, software that made conservative use of CPU and HD beyond looking nice might be "happier" than more popular applications.

Writing the above I'm reminded of Terry Davis's TempleOS but I'm not sure what to make of that feeling!