Riot you need to provide some way to mitigate burst and mobility

The two easiest solutions to both of these would be effectively turn the passive on into an entire stat, similar to something like CDR. It should probably have a cap and not be capped by a single item.

For mobility (and a lot of people are going to hate this) it is to replace a number of slows (particularly on items, but also in a number of kits) with the under utilized grounded debuff. There's a really easy way to explain this... has ALWAYS been considered more powerful than , mostly because you can't mitigate a flash's effectiveness, but you can mitigate ghost's.

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Now frankly the better solution to burst would be to an entirely new primary stat design, but I don't expect that riot wants to undertake reworking every item, adjusting scalings on every champion, and rebalancing all of it again.