The key aspect of 'what's a longbow' is that we are losing or have lost the ability/willingness to differentiate between what was and what is. In effect the original term 'longbow' has lost it's identity.
Longbow definitions offered in threads above (btw, sources would help), when compared to the bows shot today, are a good example of just how far we have departed from the original concept.
Given all the design changes I see nothing wrong with revisiting and clarifying what a 'longbow' is and isn't, including due respect for both older and newer designs and creating more applicable terms and names where warranted. It would offer a way to characterize and provide identity to distinct designs, on a fair basis. Certainly, the 'string doesn't touch the limb when strung' approach so popular at shooting competitions now is patently absurd as a longbow definition since it relates only to a bow's aesthetics and in no way reflects it's construction characteristics or performance capabilities. Having better terms would make apples to apples comparisons and discussions much easier/more credible. Having better definitions doesn't mean as much for hunting...critters don't care what they are shot with...but it would mean alot for rational comparisons re bow speed, smoothness, materials, design features, competitive venues and general construction/performance...all popular topics at this and most other sites.
We shouldn't feel threatened by a better/more specific set of terms for the gear we use. Why restrict ourselves to one generic term like 'longbow', created centuries ago for centuries-old materials, to describe the diversified and ever-expanding and complex types of 'longbows' we now have? It's not fair to the old designs OR the new designs.
Why not give each of the designs their due and be clear about their respective characteristics? Why bury our head in the sand rather than embrace common-sense? Why is the 'this is my brother Daryl, and this is my other brother Daryl' approach so attractive to so many of y'all? WHY WHY WHY ??? Why am I wasting my time writing this?