It is highly personal.
I have always thought that there was such a thing as being too granular. While exit pupil sometimes plays a role in eyepiece selection, the primary reason for different eyepieces is to allow better framing of the subject under observation.
Now, how much room do you need around the subject you are observing before you find it "pleasing?"
For me, it was "enough to more than enough and not a bit less." LOL.
Seriously.. As an example I found little value in going from a 27mm Panoptic in my C14 to a 22mm Panoptic in my C14, I grew to make my basic step a double double the field size (not a 50% increase that you recommend if you are in the business of selling eyepieces).
But the end of my conventional eyepiece observing I was doing 90% deep sky of my observing with just three eyepieces: Wide field-low power, medium field-medium power, and smaller field-high power. I found that the tiny incremental changes in field size were not at all missed, and I found that I did a lot more observing and a lot less eyepiece changing. Heck, I was using a binoviewer with a power switch and I stopped changing eyepieces at all, relying on the power switch to make all of my field size changes.
So, it is really a very personal and subjective call.
I did some of the most productive observing of my life though when I ditched the eyepiece case and went to three simple powers.
I think you are waaaay to granular though, but I will be in the minority I am sure.
I completely agree with this. Lately my observing has been extremely relaxing because I've limited my eyepiece case to three eyepieces: 30mm APM UFF, 14mm Delos, and 6.5mm Morpheus.
In the SV and AT102mm ED's those give: 24x w/3.0 deg field, 51x, and 110x.
In the SW120ED those give: 30x, 64x, 138x.
I've really found I don't need anything else. I don't think a jump from 50x to 75x (for example) really does much. In general, I see those three magnifications as:
24x --> widest field viewing and great for framing really large clusters, nebula, and starfields.
51x --> nice magnification for balancing resolution and framing for larger DSO.
110x --> best magnification for pulling out the most resolution without the image becoming too dim due to a small exit pupil. Also in my location this is about as high a magnification as I can count on almost every night.
I do not see the jump from 51x to 110x as being a "gap". If I was to make a jump from 51x to 75x, the view at 71x would lack the nice framing I get at 51x, but would not provide the resolution I get at 110x. So even though I have eyepieces that give ~75x with my 102mm scopes I just blow on by and go straight to the 6.5mm Morpheus.
So by taking out just the three eyepieces I eliminate the temptation of trying those other magnifications out. Less swapping of eyepieces means more observing.