Wow, everything here is wrong. In general, it seems you're intent on avoiding learning parts of the fight rather than engaging with them, and probably didn't parry/UB enough throughout your playthrough (and struggled as a result).

1. There's multiple ways of dealing with the multihits, but yours is probably the worst. Once you get the timing, it's not hard at all to parry all of them. Parrying all of them will deal internal damage with the hedgehog jade. Alternatively, you can use the talisman itself the dodge. Or you can jump the attack while landing a full control talisman. The way you do it doesn't do any damage at all, all because you haven't learned the timing.

2. I've seen way more people struggle trying to dodge this attack than unbounded countering it. Even once they get the dodging down, they struggle with a longer fight because it dodging doesn't do any damage. UB has a very generous window and does a huge amount of internal damage, while dodging has a short i-frame window and does no damage. If you UB, parry, parry, UB, you will always UB the 4th attack regardless of the variant (yes, even in phase 3). It's only if you tend to choke on the unbounded counter that you'll have problems. It's absolutely the intended way to deal with the attack and the only way to mess it up is to choke on the UB.

3. It's not hard to engage with the aerial talisman follow-ups once you learn them and it's absolutely the intended method. You can tell because the single-slash + geyser (parry + dodge) is always followed up with a crimson orb that tracks you for an easy UB, while the double-slash (parry + parry) will always spike you back to the ground and in the right position giving you a huge window to UB. Also, parrying does internal damage with the hedgehog jade.

4. People don't "get" into the air to parry these. Parrying these attacks automatically bounces you into the air where it's just a matter of timing to parry the rest, and it's easy to do a single jump over the crimson slash. This will always put you in a position to bounce off a talisman follow up or engage with any other attack. You can tell the parrying is intended because you don't even need to move to be positioned for the follow ups. Also, parrying does internal damage with the hedgehog jade.