I know 054A is not that advanced. it's 90's tech. don't forget 60+ 056/056A for coastal defense. if 054B is 6,000+ tonne, it'll overlap with 052d. if 054B is <= 5,000 tonne, what's the point? ships under 5,000 tonne sailing on high seas look like this.
it's not suitable for long distances. larger ships are the trend in the future. it's temporary expediency to let 054A to handle those missions that destroyers should undertake. I think what China needs is a 9,000 tonne class ship filling the gap between 055 and 052d, aka the rumored 052E.