Not sure if you are aware of the fact most murder trials, unless the defendant has plead guilty, can go into days of verdict summing up. Contrary to your view, many legal professionals, spectators and experts have mentioned that Judge Masipa has actually been fairly swift with her summing and eventual verdict.
Had she decided to discuss the nature of some witness testimony, we could have easily been waiting for a verdict next week.
The lesser firearms charge were addressed because he was guilty of one of the charges, and she had to explain why she felt the other charges were worthy of acquittal, much like she did with the 3 hour (or so) justification of her verdict regarding the murder charges.
As for her stumbling over reading - sorry, I didn't realise people have to learn verbatim their opinions. I think anybody reading from paper is subject to mistakes and hesitation. In a legal environment, there can be huge ramifications if a statement is given incorrectly regarding the freedom/conviction of another human. Therefore, reiteration or amendment will always occur.
Televised trials always receive some degree of criticism, but to comment on the fluidity, coverage and choice of words in a legal matter seems very inconsiderate and unreasonable considering the significance of what was at stake for Steenkamp's family AND Pistorious.