Emulating on hardware which shares the same architecture as the emulated machine allows excluding the transcription of instruction sets, PS1 emulation on mobiles has been perfected years ago, most handsets run the games at higher framerates than those rendered by the original hardware. The problem with emulating on a phone is that there are hundreds of handsets an emulator has to be compatible with, thus it requires a compatibility layer which in turn greatly reduces the possibility to unleash the full power of GPU's (some handsets even lack those so graphics have to be software rendered sometimes). This limitation is gone when specs are fixed. You can disagree, but be aware of the fact that you are wrong.