Personally, crafting could have stayed complex and somewhat realistic. The gripe seems to be just the level requirement for making parts. (The availability of items could have been solved by a centralised auction house but thats another issue).
The player crafter should have been involved in the fine tuning of gear. For example, a crafter with tailoring training should have been able to choose what stitch pattern appeared on a shirt. Alternatively they could choose how long a shirt is or what cut it has at the neck and how low down it goes. A crafter with painting training could choose what type of stroke or design to use. An alchemist with training could have chosen to adapt their concuctions similar to say how spells and potions are adjusted in Elder Scrolls games - say I wanted a fire potion I could make one that was just a Fire1 spell or I could make one thats all shiny like a firework depending on the variables I adapt in the crafting process.
Crossclassing could have come into things after a class has made an item. If I was a Blacksmith and I made a marauder axe for example, let me go and find an alchemist who could apply an elemental or status potion so I can have a native enspell effect. Perhaps the effect would disappear when the condition goes to 0% and after repair an alchemist needs to be sought again (hey this is an MMO lets socialise!). As another example, let my blacksmith craft my axe, but then when it is made let me hand it to a leatherworker to attach a grip which would boost the accuracy by a few percent. Again as condition wears that grip wears so you are back to base accuracy.
Also, SE should have adjusted how crafting is done. In the field I wouldnt mind whipping out my crafting item as we do now, but back in the cities or hamlets I would have liked to be crafting my shirt on a mannequin so I can see the changes made by different parts and select the ones I want. Thats another issue, parts and stuff should have been customisable, say I want a cotton shirt with a cotton patch on the elbow, why not let me make a cotton shirt with a metal elbow if I wanted to. Sadly this comes down to a design fault with the game, instead of implementing gear in parts we only have the full item.
If crafting included fine tuning every stage, then everyone would love there being so many parts to play around with. It would have turned crafters into full on dedicated jobs (coz quite literally those who love crafting would literally do nothing else if there was that amount of customisation) and Tanaka's dream would have been realised possibly.