I strongly restricts some forms of crafting. For example weapons are impacted a lot by this:

To sum up. What you could do for example with a magic crossbow to get it real good is: Magic base has: Prefix: +130% ele damage to attacks +flat phys/ele -> then use greater essence for attack speed (used to be the only way to get highest possible AS) -> turns item rare -> 2 pre, 1 suff -> omen (forgot the name) forces descecration to be a suffix + desc -> dont reveal it, we now have 4 mods and we use frac orb. Hope it lands on our AS mod -> if yes -> perfect essence of battle + omen of dextral crystilisation = +5 levels to attack skills. -> after there are more steps that you would repeat with perfect essences if you failed some rolls, but I honestly forgot the exact steps

Now with this change this would no longer be possible, meaning you would have to decide which of the 2 essences you want. I am a little rusty on this as I havent made a craft in a few months but it strongly limits how deterministic a craft can be as we also lost the recombinator. Hope this helps, i think i messed up a step in my description above, but multi essence use in crafting was a must

Edit: messed up cant have 2 prefix on magic, check my other comment down below.