...shows that the original base design was just that good...
It only shows they are locked into the concept. It being good or bad is an entirely different matter. Mclaren worked for 3 years with a particular design of front wing before realizing they had to overthrow it and start from scratch with a completely different concept of front wing. Just because a front wing works good for a car, does not necessarily mean the front wing IS good. Williams could very well end up in a death end within a few months not being able to further develop the front wing without starting off with a new concept with more potentional. Not that I'm stating it's a bad wing per se, but having the same base for a long while is not the same as having a good wing. Let's not confuse that.
The reason that nobody has copied it is that you can't just stick somebody else's front wing on your car and expect it to work. The rest of the car will then have to be designed around it.
Nobody made any mention of copying, williams using a different wing or an other team using a williams-like wing. Again, try to stick to what actually been said.
Btw you mentioned that the merc wing had many flat footplate sections. It came across from that description that they were just there to connect the outboard end to the neutral section. This cannot be further from the truth. Just because it looks flat does not mean it is not doing work with the airflow.
Then I'm sorry that it came across that way. I only described how the part looked:
The wing element protrude through the endplate and curl directly down to the curved section of the footplate.
There's quite a big space between the curled section of the footplate, and the base of the wing elements, which is filled by extented, flat sections of footplate.
There's a very tiny spacing between the wing elements and the endplate, with no integration of the elements into the endplate, or a heavily curling towards the backend. It's a little bit of both worlds, or perhaps actually none of either worlds.
I did not explained what it did, with no comments at all on the performance or influence on the airflow. Simply and only how it generally looks. I even did not include any possible wording of the neutral section. This is all you not having readed my comments at all, else we would not have this useless conversation in the first place. I can't help it if you want to read something that is simply not there and tell me "this can't be further from the truth". The sun circling around the earth also can't be any further from the truth, yet I also did not mention that.
If you want to formulate a proper answer later on, then read my posts thoroughly. You were shooting in the wild there, f1aero based his own comments on your comments and suddenly I'm facing criticism/outright attacks on things I never ever claimed, said or otherwise tried to insinuate.