If it helps, in my experience, any delay switching presets is barely noticable if at all (except sometimes on Space and very rarely on PF – I don't use the Looper in TF). Having SPILL on and using DSP+FX bypass helps a lot. Of course, most of this depends on how I use them, so your experience may be different. But IMHO, it's something that can be easily worked around, if you even notice it at all.