I had been looking forward to Lambda, principally for a very banal application: It is ever so tiresome to code a UDF in VBA such that it will play along with CSE (or modern SPILLs). Some years ago, I coded a generic proxy that could wrap any function such that it would iterate over a range in place of a single parameter. (I always felt that Excel should provide this scaffolding - I cannot imagine what your code must look like for those built-in functions that natively support this game.) Turns out, I created MAP. Today, I can throw away this code and write instead =MAP(someRange;LAMBDA(aParam;aUDF(...;Param;...))). Good times.
What prompted me to post here is another observation altogether. I have not looked into AFE yet but have instead been pasting Lambdas into the old Name Manager, where I made a surprising discovery. Many of my Lambdas that happily worked in the cell I tested them, would not work (or were rejected) by Name Manager. Turns out (from playing around - I could not find a confirmation in the documentation) that formulas within Name Manager are limited to 256 characters. (The equivalent limit for cells is something like 8000 characters.) Does AFE extend this functionality of Name Manager?