"the Eighth had technical capabilities which no other belligerent would fully match until the end of the war, especially the P-38F and B-17F."
Depends on which capabilities you mean, really. The P-38 exchanged some of the agility of a single-engined fighter for greater range, the B-17 was much better armed for defence than a Lancaster but at the expense of bomb load. The USAAF in Europe did become very well equipped for its chosen method, daylight attack, just as the RAF finally acquired an unmatched capability for night bombing.