You know the Y in the name denotes a prototype model, right? Practically speaking, you'd also lose formations and be 10x more vulnerable than a standard 3-ship formation that we have already. They were so heavy that when the bombers they were "escorting" dropped their bombs, they got left behind and pounced on with very bad results. They also never served in squadron strength, and never had a production run.
The old requirements were: 1) Production models only (no prototypes or field mods), 2) had to serve in unit strength at least (no 1-offs, etc), 3) had to see combat (qualifies for this, but not the others)