you're right i cannot say 100% certain that will be the same. i was just looking at the few examples they gave and was trying to look at how the recipes now are all similar so i would expect all the changes to remain similar.
for example the difference between hempen and cotton robes are nothing more than what cloth and yarn you use along with a higher level shoulder guard. we look at hempen and see they basically replaced the fronts, backs, and sleeves with just one bolt of cotton and one piece of yarn.
both of those parts are alot farther below the rank of the parts they produced. yes, cotton and yarn did make a r31 part for a piece of gear, but by looking at the other recipe changes we will likely be replacing that r31 part with a piece of r19 cloth. that was my logic at looking at the ease will be increased to hq the material. it will be easier to hq that r19 piece of cloth than it was to hq the r31 part that used it. that was what i was talking about by no change in how easy it was to hq the part itself.
take a look at that r50 cobalt sabaton recipe they released. the high level parts were removed and, yes, the cobalt ingot is a high level ingot. the problem is using that same type of conversion the r48 iron sabatons use mostly iron in them so those r50 greaves that are difficult to hq would be likely replaced with a r12 iron ingot. that was what i was looking at was not one single aspect, but the amount of total revisions that would be needed to redo every single item produced.
the change may work for some items and looks like a good change on like cobalt sabatons as it is a new added recipe, but the problem is the old system will be very difficult to go through every part and material in game and try to revise what rank weapon they belong to.
the reason i see a problem is take a look at the iron ingot as it is now.
http://ffxiv.yg.com/item/iron-ingot?id=10002012
the item itself is a r12 blacksmith or r23 armorer synth to make the ingot. it is used in 43 different synths and ranges from a r10 carp synth all the way up to a r50 blacksmith. the total changes would have to completely redo all of those synths that require an iron ingot and every synth that any item that was part of one of those synths to get all of those parts to all be within range of the finished products.
i do agree that the changes do depend on alot of other factors, but all we can do now is look at the only information we have been given and look at the overall changes. we can say we hope this or that happens, but at this point all we can go on it the only stuff that has been confirmed.
edit: btw i liked your post because i do not have a problem with an opposing opinion and i appreciate the time you have taken to actually put out different points of view and not attack personally instead. not to mention i have agreed with your adding touch ups to the parts since day 1.