Good point that you may not get a completely full seal anymore with the AirPods when wearing both. However, in my personal case, I’m still able to get Good Seal result with the AirPods fit test myself. So I think this will vary depending on the personal fit for each person in the first place. I think I’m lucky that my ear canals are big enough to be able to seat the hearing aids’ receivers deep enough into the canal that there’s still enough room for the AirPods plastic tips to continue to make a good seal at the opening of my ear canals.
And I think if you no longer get a good seal like before without the hearing aids, then there’s also a higher chance that it won’t be as comfortable for you anymore with both on. It does continue to feel comfortable for me, though, but then I haven’t really tried to wear both for at least an hour yet because I just thought of this but haven’t had a particular need to wear both at the same time for a long time yet.
You’re right that wearing the aids together with the pods removes the need to put the pods in the Transparency mode because the aids will be giving you that now. You may also detect a short echo if they have different enough latencies. And even if they have the same latency, the double amplification may make the ambient sound louder than you want. And even if you don’t mind that, you can probably save some AirPods battery time by turning off the Transparency mode.
As for the ANC, you’re right that there’s no logic in using ANC while wearing the pods with the aids because the whole point of it is to be able to hear ambient sounds clearly. But if you want the convenience of getting instant quietness momentarily (or even for a longer period) without having to remove the aids, then muting the aids’ mics should do the trick, because there should be enough occlusion with both of them on already. But if still not quiet enough for your taste (like sitting in a very noisy airplane), turning on the pods’ ANC to double up on the quietness may help, too.
The aids’ wires causing a small leak in the pods’ seal is not necessarily bad from the perspective of letting in some of the natural ambient sounds for the ear to hear (where the loss is not bad), and for less occlusion. The integrity and bass of the streaming sound may be affected a little bit due to the leak, but it’d still be a good compromise to accept. You can always adjust the tonal balance of the streamed sound to compensate for this partially.
I’m not sure how streaming sound and stability is improved with this approach. Would you care to elaborate? I’m not sure what stability here refers to. Thanks!