The way I look at it, there are two primary reasons to avoid leveling right now: 1. Epic boss events and 2. WD events. Based on past forums posts, the majority of the community would agree that these events could use some improvement.
1. Epic Boss event - it has been suggested multiple times to include more tiers for the boss health. This would definitely be an improvement over the current setup. However you would still have people trying to stay under certain thresholds. Maybe not to the same extent as now. In order to completely stop worrying about your level, why not include level of the player in the algorithm of the boss health? Is something like this possible to do? So both health scales each level up.
2. WD events - this is probably the biggest reason not to level. Obviously a new formula would be the best option, since the current one is based on the levels of your target. I suggest keeping the core idea in it, your level and the level of your target. However instead of making it related on the difference, or the gap of the two, change it to be additive - I mean take your level and the target's level and that's your WD score for that battle. It would provide more clarity. It would change it some, level 300 successfully attacking another level 300 would award the more points.
Thoughts? Criticisms?