There's an aftermarket trigger spring that's designed different from the stock spring and should eliminate trigger spring breakage. I think Wilson Combat makes them. If I recall, there's one installed in one or both of my Beretta 92 pistols. It's easy to install and I couldn't tell that it changed the character of the trigger.
There's some weirdness with the locking block issue. I've seen some folks claim they got crazy high round counts, even with the old blocks while others say they just break right and left. I think that part of it could be that they need to be fitted so that the stress is fairly even on both "ears" of the block. I think that there may be some of the pistols out there that are prone to breaking locking blocks. I've never had one break on me but I do have a spare around here somewhere just in case.
Agree that a broken locking block doesn't require a barrel replacement unless the armory doesn't have any loose blocks. Then they might replace the (barrel, block, plunger, pin) as one assembly.