They are delivering on more chests by the month. So far there have been many event each rewards a loot box or 2 every month. In some ways it does recover the difference of OE value lost from the changes. Not to mention that now shards are worth less for disenchanting, there is a higher incentive to reroll shit valued shards for a better skins, granted you really don't care what skin you get for what champ. Just having 1 skin for all champs is a bonus in my book. And with the skins that Riot's be chugging out, all priced at 1350, you have a good chance at nabbing those.
The only reason you'd ever want to buy bundles of chests is that if you have a shard or two you're looking into crafting. Only then will you start saving on cosmetics. You'd be getting skins at a lower cost than they would be if they weren't on sale, and you'd keep some orange essence for when you find another shard you'll want to craft.