Solid Hardwood, Engineered and Laminate Flooring - Removing V-groove

Any advice is welcome.

I have a newer, variable width 1/2" - 5/8" deep oak flooring with a wide V-groove (1/8" wide by about 1/8" deep). This floor butts up agaist an older, deeper colored 3" wide wood floor at a doorway. There are also small gaps in between the older floor planks, though not as deep or wide as in the newer floor. These are not V-grooves, and not really noticable anyway.

I would like to sand the whole house: to freshen the older floor, and also remove the annoying v-groove on the newer floor, and give it all a good smooth finish.

I have heard that applying polyurethane to a v-groove floor will result in uneven (longer) drying of the grooves, and a weaker finish overall.

So, if I do this, should I do it with the intention of removing the entire V-groove or not do it at all?

I forgot to mention: there are plugs in the newer, v-groovey floor planks. I believe these are at the ends of the planks, and they cover countersunken screws. Would this pose a sanding hazard, or problem when the finish is being applied?

Your going to sand most of your floorings life, if you try to sand the bevel out.