I think we agree on some points
I would think that older players with a hoard of spotty eggs will have already bought all the items in the last event and so not be able to use them except for the buffs, the old limits are still in place. And they can indeed swap these eggs for stripy eggs if they wish, it is called trade. Unfortunately many may well sell spotty eggs for very high prices, but I find this happens anyway every event. Lower lvl players may be able to get a few items, and higher lvls can get more, this is the way all events work. This event will be no different. As players stay in the game and lvl up, they will access more. My first ever event I did not manage to get all I wanted, now I can. It's the same for all players every year. Guilds can of course help their members by spreading the wealth. Although the new items are fairly poor, ALL players do still have access to the old event items, which I think is far more preferable to them having removed spotty eggs entirely and having nothing from last year. Maybe if the prizes for this year were a bit better, people would feel it was a bit less unfair.
The idea with the stripey eggs seems to be to get people actually involved in the event more. More quests, more to do, more ways to get eggs, there seems a lot of content, so all lvls can achieve something. And the hoarders will have to participate too, rather than buy everything on day one, and complain of boredom the rest of the event