Hi @madz, welcome to the community!
Doctors unfortunately still work on outdated assumptions most of the time, so your gut instinct to question that advice is spot on.
Here is some info on how to safely taper Effexor doses:
https://taper.community/resources/blog/how-to-taper-off-effexor-xr
To quote from the guide:
"The standard commercial capsules come in 37.5mg, 75mg, and 150mg strengths, jumps too large for the final stretch of a taper. That gap is exactly why bead-counting exists as a technique. Horowitz and Taylor's 2019 paper in The Lancet Psychiatry explains that receptor occupancy follows a hyperbolic curve, meaning the last few milligrams off the body have a disproportionately large pharmacological effect. For a drug that already clears fast, that combination is what produces the withdrawal reports patients bring to forums and support groups."
You might find this helpful in making an informed decision; and maybe even discuss it with your psychiatrist, if possible.