Yep, the brake fluid upgrade is a relatively cheap bit of "insurance" for spirited driving. Where I drive loss of brake power == "die now" since missing a turn means either running into a cliff or flying off of a cliff.
$$ brake lines are less clear if they are a worthwhile change. I had them on my E-type and they sure look good, but you cannot tell by physical inspection if the lining inside of an $$ line is deteriorating. With rubber lines there will usually be some soft spots apparent before they fail. OTOH, $$ lines seem less likely to be damaged by road debris. I was told that mushy braking has more to do with the brake fluid than the brake lines.
For me the point with the Michelin A/S 3+ is that they are all seasons with near summer tire performance. I need all seasons since summer nights are often cold high in the mountains. I don't think any of the competition comes close.
I do not know of a source for 2 piece rotors for Giulia 2.0T at this time. Stoptech makes something that is close and I am hoping they can be convinced to make a kit that will fit. They seem to be much more interested in promoting their "big brake" kits with the 2 piece rotors which typically yield larger diameter brakes for about the OEM weight. One downside with a big brake kit besides the risk of upsetting the Nannies is that clearance to the rim is reduced. CF rims are heat sensitive so more clearance between the rim and the brake is a good thing.
Interestingly, an Etype has 0 unsprung rear brake weight: the brakes are mounted on the sides of the differential. I was told that some Corvettes have this arrangement as well. The problem with this scheme is that the rear brake cooling is poor.
