If Holly is not encouraged to keep trying pole-dancing, she will not interact with Ivy at all in some early scenes, this leads to some changes:
-Holly won't go to the sex shop with Lena and Ivy
-Lena's conversation about Holly's past (family, previous relationships, etc) will be had over dinner with Louise, not while drinking with Ivy
-Holly won't be there for the club outing in chapter 7 (where Holly first meets Marcel)
-Holly will wear her glasses instead of contacts during the book fair with Ian
-Holly will be there for the shopping trip with Ivy and Lena in chapter 8, but won't try new underwear
-Holly will be less fit (no defined abs) during the shoot with Lena in chapter 10
-Holly won't go to Ivy's birthday party
-She won't try to flirt with Ian in chapter 11 if Ian is single or broke-up with Lena
-She will comment on having too little stamina after having sex with Ian in chapter 11
-In chapter 11, Holly will unavoidably give pole-dancing another try, if Lena doesn't have sex with Ivy in the showers and doesn't drag Holly into a 3some in the showers either, then she says she will probably try Yoga instead in the future
-In chapter 12, she cannot be "fit" and Perry won't comment on her looking "hotter"
-In chapter 12, she will not try to smoke weed, unless she had the 3some with Ivy in the showers (the 3some activates "holly_slut")
Also it removes some opportunities to increase holly_change, I think you can still get enough points elsewhere but I did not check if all thresholds can be reached.
Overall I'd say keeping her away from pole-dancing is a "anti-corruption" fool-proof measure, with the only opportunity to re-enter kinkier content being the 3some in the showers with Ivy. Otherwise only worth checking out if you want to try a variation of Holly that is "softer" and more nerdy for longer in the story.