Lono talks about this in one of his talks
https://www.youtube.com/watch?v=-d3fvpMjeGk
Talk summary
1. Open up champion mods to all primaries
2. Add champion mod slot to all primary exotics
3. Add weekly modifiers to buff specific weapon types against champions to promote loadout changes
4. Start adding Secondary weapon champion mods
5. Power weapons don't need champion mods
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Opening up these mods to other weapons would allow loadouts customized to each player as opposed to having to restrict to certain weapon types.