Actually it's not lies i'll have you find. (And slander is an attack on a person, not applicable to this context)
Simply 'Interrupting' the old animations would be pointless for a number of reasons, mainly that it would look horrid.
The major difference between 1.0 and 2.0 is the speed of battle, in 1.0 abilities had a longer cool-down and abilities took longer to cast, we even had an animation lock for that to ensure the realistic look of the animations, so we weren't sliding across the floor whilst casting a spell or firing an arrow. So essentially these older animation would never have worked in 2.0 without simply speeding the frames up which would have looked horrendous.
The animations in 1.0 were considerably slower and suited that battle system, you may have noticed almost all the animations were adjusted or re-done for 2.0 based on this fact that the speed didn't suit them anymore, hence why almost everything was re-done.
The animations in 2.0 aren't by any means awful, but the casting animations from 1.0 were removed not just in favour of the battle system but also for thematic reasons.
Black Mage for example has a different animation set for casting Fire versus Blizzard, which looks much nicer than the old 'tap my forehead and cast' that 1.0 had.