As some already said it it is only tombstone gear that will be meldable
It dors concern crafting gear

Plus the 180 might look good or stronger than the 170
But there is a CP loss... And unnecessary craftmanship on many piece

As i keep telling my fc, 180 do not worth buying them
Especially for the huge price
26 red script token for the tool...
Which is around 400 comp
So 80 crafted 2* comp
Which mean more or less 20 equipment (main or off-hand... Torso...)

...

Like small hobbit said... The 150 gear melded is enough to craft 2* with everyclass
And I personnally add NQ Fisher stew because i have around 400cp and the craftmanship requirement