[2020] Should Thatcher be made a one speed?

I don't think Thatcher needs his speed adjusted at all. From the recent Designer Notes, Thatcher is apparently being banned 36% of the time in Plat+ games. From my personal understanding, most players are banning him due to his gadget being really strong, not because of his speed. How would you suggest reworking his gadget? I don't agree that he needs a full kit rework, but maybe his nades could be tweaked somewhat.