Yeah tell me abt that, on the phone while cycling or listening to headpones then not able to ride predictably in a straight line. Can spot from a mile away coz not riding in a straight line and you better give a wide berth.
Also rather dangerous if no skills to ride and not keeping left or like taking up 3 aside to chit chat (max i have come across is 4 abreast at Bay East Garden). Got into so many close calls with the Anywheels. And with no lights / some rather dim lights you dont even know they are there until the very last moment as bikes are silent, then if put bluetooth speaker then some might not like (but srsly bo bian). But the squeaky ones are still ok, can hear.
Then of coz there are also runners/walkers doing the same, once got 4 walkers on the cycling path @ Bay East Garden. Both side bicycle traffic need to get onto the running path to overtake.
Another dangerous situation is if runners running against direction flow dressed in black and with black complexion on the Cart/Cycling lane instead of the running path (actually even if 0.5m past the running/cycling demarcation lane still ok and safe since the cart/cycling path is wide enough). Quite prevalent @ Bay East Garden and ECP where there are dedicated lanes.
So it's like a jungle out there.