Completely agree, the LNER is certainly not saturated on the whole with core engines such as J27,J21,J6, Aspinal 0-6-0 and Stanier 2-6-2T (both west Riding X-over),N5,N1,A5,A8,C12,C14 and B16 in addition to your suggestions still to be produced.
I think what grates is when there is more duplication of GWR (Pairie,King and 0-6-0T) Southern(Terrier and 71) engines. Surely this is causing more saturation, I don't see it as competition but a missed opportunity.
Give me workstained everyday locos any day of the week over one offs and named locos.