If it were a flat reduction rather than a percentage, the over-bearing nature of the 2min burst meta would make a retooled Spear actually incredibly good (sometimes), based on the fact it'd give you extra burst windows, or better yet, cause them to align with more favourable parts of the fight. Thinking about P7S having it's 6min window during Inviolate Purgation (with the knock up at the start), but with a Spear effect that is, for example 'reduces the CD on abilities by 15 seconds' it'd shift it forward