Bath Towels Light Duty?
That depends on how the household uses them, IMHO.
If one does a serious scrubbing down in the bath, then dries off with towel and it goes into the hamper after one use, then possibly. OTHO if the things are used as a bath mat (why do men do that????), dry the family dog, wipe up spills, used as a wet wipe after incomplete hand or body washing, and so forth then a little stronger laundry methods may be required.
Personally find Vaska too frothy for use on terry-cloth items in my Miele as the machine uses so much water and only does two spins before the final rinse (one short burst after the third then another longer spin after the fourth rinse), that anything very absorbent will sends torrents of foam/water gushing as the washer begins extraction. If this amount is too much for the pump to handle the washer slows extraction down. However as the timer keeps moving it can and often will happen that the cycle will not fully extract before going into the final rinse. This leaves all that froth inside the tub, sump, pump and so forth.