One reason more to make Maemo Leste for Booklet 3G, from wikipedia:
" GMA 500 graphic system. Rather than being developed in-house, this core is a PowerVR SGX 535 core licensed from Imagination Technologies"

And why PowerVR SGX 535 sounds so familiar is that N900 has PowerVR SGX530 and Droid4 has PowerVR SGX540. So it is just between of them.