The ships did not worked well. Otherwise, there would not have been restrictions to their use. All surviving ships had significant hull damage after the Falkland War, because their hulls were too weak - that could be a similarity to the LCS. Another one was the Type 21 nickname: Porsche, i.e. raceboats, not proper warships.
For sure, there were also other ships with too weak hulls - as I had written, there were many bad designs in this period (see e.g. also the Type 42), but the Type 21 was one of the worst.