Here's another way to slice the data - look at the
server distros, which is the target platform.
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My point is that phpBB needs to accommodate a business model whose users who
can't upgrade their OS every few months.
PHP needs to support every application on the server, not just phpBB. If "other" software can't work with PHP 5.5, phpBB will not get updated until everything works together.
The objective is to
cautiously increment the minimum version requirement while not breaking other (not phpBB) software. That's why I requested 5.4.16 (and that older phpBB versions will still work for a while).