I think the interface itself of the OT is pretty straightforward and well designed for the most part.
The difficulty, I think, many people face with the OT is a conceptual. The OT has different notions of project and sample management and arrangement compared to other systems, and indeed some of Elektron’s own gear. To the newcomer, this might seem wilfully obtuse and idiosyncratic.
Elektron is to be praised for taking a step back and questioning convention and reimagining other ways of engaging with electronic instruments. This can open entirely new creative opportunities, albeit at the neglect sometimes of more conventional needs and uses.
From a design point of view, I would rather question the analog series of devices. Namely, 1) the small and cramped screens and 2) the shift toward performance ‘mode’ of operation.
With the OT, assigning the crossfader is simple and elegant. You can do on the fly while designing sound or performing, and easily try out different assignments to get a feel for what works. With the Analog series, you must set up knobs/pads in a horrid little UI, and do so outside of the flow of making music. That’s a shame, and a step back from one of Elektron’s historic principles of having no separation between creating and playing.