First I would like to know when and what players tested Aatrox for the rework cause as far as I know, they didn't. Please provide the proof cause I'd love to know.
Second, the thing is the thematic style of reworked champs is the same. Swain STILL is a durable spell caster, Taric is still a healer with defensive buff capabilities, Reworked Aatrox is NOT an AA fighter who excels at close range with mobility and great sustain. He's an AD caster with moderate sustain and almost NO defensive skills besides blood well that's on a long CD and was tacked on to his ult. Old Aatrox could use Q for escape, E for slow, it gave him a level of comfort and safety, but not a huge amount that exceeded any other champion's. The New Aatrox W has an extremely short side to the cast side, making it defensively weak, and his Q is almost useless at close range for the first 2 casts because it does reduced damage and doesn't CC as well as lock him in place and use a long cast time. The E is extremely short, sure if you see the gank coming and spam it twice you can maybe get away but it functions like it's design, to reposition in a fight. Besides that the E is so short that if an enemy is meleeing you and you use your first Q and E backwards, you will NOT hit them with the edge if they chase you. His kit is meant for chasing yet he has weak close range offense til his 3rd Q which can be seen coming cause he has to cast the first 2 and the W again is weak if the enemy turns and fights.
Third, Personality: He's completely different, that is undeniable. There was this air of respect Old Aatrox had for enemies. In his quotes he literally says "Even cowards can give their lives." It's a point made that he believes in combat, not just winning and slaughtering people. Sure he will kill people who don't fight back but, he respects the fight, and the fighters. That's all gone, now he's just a revenge driven screamer with a weird unexplained accent. He was that guy who might be evil, might not, but he had almost honored and seemed ethical to those who choose to fight. His rework is like that kid on the street screaming " I WISH YOU WOULD, DO IT" ex. almost all his lines end with "COME, FIGHT ME." Oldtrox didn't go and chase a fight, he fought those who chose to and honored them. Those that didn't he slaughtered but he didn't just scream at people to fight him, he let them choose. He was in the best use of the term, a duelist, not a butcher.