The issue is that Biochem / Cybertech are now the ONLY professions where the main draw of getting to 400 (IE: Those Stims/Adrenals/Medpac) have been restricted to force you to KEEP those professions.
Artifice, Armortech, etc - Your main draw is being able to craft your own Rakata gear and crit on it, to allow you to place Augments in your gear that makes it superior to all other gear and creates the BiS for that slot.
------ The issue with this is that, once you have goten the level 400 BiS, you can now safely drop these skills and pick up something else with absolutely no concequence to your newly-made gear.
In comparison, if you picked up Biochem and did exactly the same thing, your now having your level 400 items revoked. If anything, this isn't a beef against the biochem nerf - They need to nerf every other profession as well