There's an old military adage to the effect of "Train as you fight" (becasue you will fight as you have trained).
The way a person shoots with gloves will be different, in subtle but certain amounts, than without.
For some, that difference is telling.
Which means having to treat being gloved in the same way as weak-hand practice. And it you are shooting without a glove anyway . . . Now, that's an over-simplistic arguement, but one that will be used.
Climate will be another issue. Where it gets cold for a significant part of the year, training during glove/mitten weather only makes sense. However, down here around 30ºN latitude, wearing loves due to the weather is not very common. This week, here in DFW, the high temperatures are running 103º to a forecast 107º on Friday--which will not be good weather for gloves.
Now, for all that the above is worth (±2¢); I have used "plumber's gloves." These are water-resistant/wicking gloves with "grippy" bits on the grasping areas. Not much for padding, but good for gripping (just the ticket for really cranking a stubborn bit of PVC, or not dropping a set of slip-joints).