i dont understand it either... how is this better?
for a Thruster mod of DDT you will need to have:
3x Specialiced legacy firmware
1x mech equipment
1x mech comp.
1x Chromium
1x config comp.
1x selenium
1x MCF
1x Cadmium
1x CIF
1x Pharma insulators
HOW IS THIS BETTER???
Selenium and Chromium are found the same places as Cadmium (mining / planet surfaces), so - with per-material storage limits - you can pick them up while looking for the Cadmium. A little bit of smart prospecting (or reading the inevitable "how2engineer.docx" where someone else tells you where to go) and you can look for all three on the same planet.
SLF and MCF are found at the same places as CIF (surface beacon scans) and much more frequently. Again, if we weren't busily throwing them all out now to make room for the CIF, we'd already have 100 of each anyway.
Mech Eq., Mech Comp and Config Comp are again all from the same source (degraded/encoded USS, though they show up in ship wreckage too) ... which you'll find several of while looking for the high-grade USS for the Pharma Isolators.
In other words... in the process of looking for the high-grade items, you'll be doing what you need to get all the intermediate materials too. If you do miss a few due to getting unlucky, well, the extras you picked up while looking for these bits can be traded in at the material broker.
This individual change, on it's own, if it's the only one they implement out of the whole proposal? Definitely not an improvement.
The proposal as a whole? Certainly an improvement for both hyper-optimisers and casuals [1]. I suspect on balance once the shock of things changing is over it also might be popular with the "I want G5 on several ships but don't care about god rolls" crowd too ... but that's going to depend on the details.
[1] Actual casual engineering users will have to be levelling up their engineer rep as they go anyway, so their first ship will have to go through the G1-G5 cycle on the bits even in the current system for most of its modules.