If you do a light roll backwards while locked on to an enemy, your roll attack will come out as a neutral attack. Here’s a comparison of retreating roll attacks using light and medium weight classes:
If you light roll in any other direction you get the fast roll attack, so this only affects retreating light roll. This isn’t a problem for weapons that have fast neutral attacks with forward motion, but some weapons have very slow, rooted-in-place neutral attacks which don’t feel good to use after a light roll. That includes weapons like the Gilded Twibill, Tooth of the Ancient One, Short Bardiche, etc.
I also have another related piece of feedback for light weight builds: some of the moveset changes when you go from normal to light weight are extremely unfortunate.
Shattered Sun, for example, has a nice poke attack after a medium roll. With light roll, the poke is replaced by the extremely slow and punishable running attack. Ironically, being light weight makes the weapon much slower and more unwieldy considering how important roll attacks are for two handers and how unusable the light roll attack is. There are similarly unfortunate changes for some other two handers, but Shattered Sun is one of the worst cases.