With emphasis on “might”. It shouldn’t take much practice for anyone to be able to, under any load, shift without 3-5 second power changing the slightest. On my graphs, even switching between sitting, standing, sitting, isn’t visible.
Shifting should be like shifting a sporty car or motorbike, but instead of a clutch, you just ease off the power for 0,2 s and then apply the same power again, but with different torque/rpm.
Practicing this indoors as well, until it becomes natural and intuitive, should be beneficial for anyone.
Yes, I’m in the non-erg camp.