To date I have heard of zero compromised seeds that were generated using on-board RNG due to entropy issues
Dude what rock have you been hiding under? Randstorm was disembargoed almost three months ago. BitPay had to scramble to get all the people who used Bitcore to regenerate their seeds:
The awful thing about keygen entropy bugs is that you can't unit test for true randomness. This leaves people vulnerable to entropy bugs ten years later which is exactly what happened with bitcoinjs.
I think you're doing people a huge disservice with this kind of fearmongering. Put your time to better uses, like spelling out a clear, precise, easy-to-follow-and-hard-to-fuck-up set of instructions for generating a seed using dice. The gold standard is this: roll the dice, convert to seedphrase by hand (using pencil and paper and word tables), import the seedphrase into two airgapped wallets based on completely different software, make sure each can spend the other's UTXOs.