yeah that would work but with poor user experience.
You wouldn't get any stats until you submit a valid block share. For a solo pool like ckpool there is simply no other reason.
The pools difficulty is just a handshake in the stratum api.
For example:
you can send 1 share >100k with fluctuating stats.
you can send 10 shares >10k with smooth stats and balanced bandwith/ressource usage.
you can send 100 shares >1k with smooth stats and higher load
and without this limit you would (D)DoS the pool

As the others have said your "Best" should be > network difficulty for a valid block share.
Otherwise you can check that everything is working as expected (The Apollo generates a handful of accepted shares every minute).
Or just for fun to see how close your best share was but without any future correlation.
And you can see if your best share is statistically average or good/bad luck.
Ok, I am getting there.
- makes sense.
- That means, that if out of a pure luck tomorrow early morning my Apollo finds a valid block, then I will see a number higher than 103T in my Best Share window of the Apollo Dashboard. Correct?