I have absolutely no issue with them letting SS1s into Blitz. However I would not expect the result to be any better for SS1s in blitz if not worse.
- There are significantly more ships in blitz capable of detecting subs
- HHs are already prevelant in blitz (even if used for Ship-Ship)
- SS1s are bad enough as it is, with a crew under level 60 your in for a world of hurt in a small map, great deal of sonar/torps/hhs.
Basically your in for a world of hurt in blitz or gb in an SS1.