These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Also, it's mentioned at one point that the reason Vivio lacks many of the abilities she displayed in StrikerS is because her linker core was damaged during the battle on the Saint's Cradle. This could have been an interesting character exploration if we'd gotten to see Nanoha's reaction to having effectively magically maimed her daughter, but instead it serves solely as a blatant excuse to nerf Vivio so that she doesn't curb stomp the other girls in the tournament arc.
Unfortunate Implications: For being a manga so focused on family and friends, no one seems to notice or care that 12 year old Einhart lives alone and in her own words has always been by herself.