So after testing a few things out despite early optimism from a few people I think it's fair to say this update was a straight up nerf to crafting disguised as a boost.

Things negatively impacted: Lost of boost from paid speed ups, huge decrease in diamond acquisition, and while new all boost from say just every 4 hours or from scrolls get divided amongst your slots.

So if you ignore the extra slots if you stick to crafting splinters only you only really lose the initial 4 hours off a 3 day craft. Not too bad though losing out on being able to speed thru some rubbish into useful stuff after a splinter is done before moving onto the next is kind of a turn off.

But if you crafted other things too it's kind of a huge deal. Some are probably thinking well it's balanced out by being able to do multiples at a time you get to make other things while still making the splinter in the same amount of time... but it's really not because you see having multiple crafts going actually slows down how fast you make the splinters since the boosts get split and worse doesn't account for how much time is left. 1 minute left on idk a power cube and a bunch on a splinter... power cube gets finished and splinter only gets 2 hours off. I don't have a 3rd slot open but I can only assume it gets further divided. Those 3 splinters might actually start taking almost the full 3 days now instead of the 1-1.5 they were before. And that doesn't even account for all the time and diamonds spent to unlock extra slots

Not usually one to get up in arms over the updates because usually the complaints are just how come you didn't give us more. But in this case it's actively hurting the only really source of advancement in the game. Really hope this gets fixed in some way or another. Because progress kind of already is a crawl and now it getting slower and smaller benefits from actually playing really discourages actually playing the game

Edit: it appears the dividing thing I was getting yesterday has stopped so guess just normal new update bugginess. So that point is gone. Though it still remains somewhat of a nerf to people who can't keep logging every hour but can sit down once for a few minutes to craft a bit.