Eastern
Hopefully not pontificating, nor 'teaching other folks grannies how to suck eggs'. It's not so much of an issue on a relatively quiet Twr frq but congested RT is/ can be a problem. For example in the recent DHL/ Tu-154 mid air the DHL crew were unable to get out the crucial 'TCAS Descent!' call that may have saved them all, due to the freq being blocked.
You've picked me up on that one point you mention above and made your own pertinant point in reply.
Nevertheless would you not agree that there is plenty of scope for improving RT voice procedure and also that a lot of stuff is just woffle, repetition or the sort of 'belt and braces' security type stuff done because of your own experience with bad RT procedure in the past?
Going from what you've posted above perhaps you had better give all your clearances out in duplicate.
Or shall we make in it triplicate just to be on the safe side?