Well, Damian would be inconvenienced (and probably more people as well). A few times, I've tried to debug or enhance his code and started off with adding 'use strict'. I did find bugs this way, but it requires a lot of work before you get there! (Nothing personal against Damian, and I've had that experience with other people as well, but Damian is a known name here, and my ex-coworkers aren't).
A main reason to not have use strict or warnings mandatory is the fact that perl4 doesn't have them. By making strictness and warnings the default, programs would break - a high price to pay for the small gain earned (a few keystrokes).
I don't think they should be mandatory. BSDM should be done with explicite consent, just like in sex.
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