The author himself providing clarifications on where the script works and where it doesn't is not enough for his/her scripts to be considered trustworthy to be run on a production environment (atleast where i work my boss would not take that for an answer). I do not mean that as anything personal against the author but such trust is built over time from blogging repeatedly (one way), and prior experience perhaps from using something same author did.

The situation 1 you describe is exactly what I was referring to, a one off emergency may happen that may need use of such scripts. The average dba cannot just predict such situations happening and when they happen cannot just use a script he/she finds. We need third party supported tools exactly for this reason. Thanks.