That logic isn’t used in any other discipline:

“We only cover bad art — we don’t focus on students who go on to be professional artists.”

“We only focus on bad English — we don’t focus on students who go on to be professional writers.”

“We only focus on bad history - we don’t focus on students who go on to study history or social science.”

Each of those has an AP and IB track, competitions to find elites, etc — just as mathematics should for high performers.

If as an educator, you only teach to the lowest common denominator, then you’re failing the children you’re supposed to educate.

To me, your post reads as if you’re bragging about failing at your job.