Although the validity of it comes into some question at times, you might want to research overchoice/choice overload. In sales settings, it's commonly believed that too many choices is actually a hindrance, not a positive, and clients are more likely to freeze or stall when having to make a selection between a large number of items.
Personally, when commissioning artists, it's because I like their art style as a whole and think my characters would look good in said style, not because of some super specic details. I'd really rather talk it out with the artist if I wanted specific bits, but I wouldn't commission someone who couldn't provide a solid level of consistency among pieces in the first place. While being able to do a lot of styles is impressive, it can also appear like there's a lack of focus on any particular one to a random person perusing... if that makes sense?
In a way, having things listed on a chart almost feels more limiting. I'd rather just see examples of diversity, that are still consistent in style, across a portfolio.
I have 100% been disappointed in other artists during commissions, but only when it's... clearly obvious that not every piece gets the same level of attention, or their commission pieces are significantly less impressive than their personal art.
In the end, limiting what you provide commission wise would also be easier on yourself, as well. Less overload, aha.