Yes - and that was the whole issue.
According to my father and most of his personal friends and comrades (incl. e.g. Steinhoff, Lützow, Priller, Barkhorn, Rall, etc. ) - aircraft such as the Dorniers, Heinkels, Ju-87's and Me110/210/410 should never have been produced after mid 1943 - but only Me-109's, Fw190's and the promising variants of the Ju-88.
Same goes for the V-1, Me-163, Do-335, Salamander, etc. - draining huge material and human resources for little to no effect.
I wonder as to how an increased effort towards the Ho-229 would have payed off - however neither my father nor his Luftwaffe comrades had been aware of that aircraft.
However the "real" issue for the Luftwaffe's increasing inefficiency were the poorly trained pilots from 1940 onward and the inability of the Luftwaffe to maintain an adequate rotation system. So basically it wouldn't have mattered what fighter aircraft they would have gotten - but far more pilots might have survived.
My uncle was a Bomber pilot the younger one a fighter pilot just as my father - and the Luftwaffe had to relegate Bomber pilots and Bomber squadron leaders to run Fighter schools - such as the one where Erich Hartmann got his flying and advanced flying training. Hadn't it been for an experienced flying instructor like Rossman? - Hartmann would have gotten nowhere.