[humanpuff69]

that is the biggest flaw of otg you cannot charge at the sametime . and with removal of headphone jack that on some phone basically use otg because the sound card is on the dongle itself you cannot charge and use headphone at same time . the solution is probably to use the wireless alternative for mouse and keyboard use bluetooth and for charging use the wireless charging but that isnt great soultion either . and like @deanhills says its need special otg that probably only work on specific tablet/phone so it isnt worth it for most people and probably why otg doesnt took off . it is rarely used on top of that with this charging problem