I also had major issues with the Pixel 6's reception to the point I was unable to make and receive calls. That's aside from the numerous bugs and other issues I had with the phone, months after its launch.
To answer your question, will the Pixel 7 get the Snapdragon x65 modem? No, it's
rumoured to get the Samsung Exynos 5300 modem which hasn't been used in any other phone, so the jury is out on whether it'll be any good. I susepct it'll be a weaker modem than the Snapdragon modem by a long shot, but hopefully it won't have the reception issues the Pixel 6 has. Why won't they use the x65 modem? It seems Google have contracted Samsung to manufacture the Tensor processor (which is a throwaway Exynos design) and use Samsung's modem in the phone, so it's extremely unlikely we'll see the Qualcomm modem in Tensor.
In addition to that, the Tensor G2 is looking to be yet another flop of a processor for the Pixel. The Pixel 6's Tensor has by far the worst performance and battery efficiency of any modern flagship procesor.
Link
It's even worse than the Snapdragon 855 used in the Pixel 4 back in 2019. Now the
Tensor G2 is rumoured to have the exact same, inefficient and hot CPU setup with two Cortex X1 cores yet again, old A76 cores and old A55 cores, just running at slightly higher frequencies. Why Google wants to continue with this poor setup rather than just adopting a Snapdragon processor is unknown, but at least the GPU gets an upgrade to a Mali-G710 which should see improvements.
Add to that the fingerprint scanner was the slowest and least reliable FPS on any modern smartphone, and who knows what new bugs will be introduced into the Pixel 7, no, I have absolutely no intentions of getting the Pixel 7/7 Pro at all. I've already experienced the Pixel 6 Pro. Once bitten, twice shy.