On a small to medium timescale it can go either way. Even a timescale of months is too short to know if Monero will be up or down vs Bitcoin. SoV implies long term as in years or longer. For example, all of 2022 you would've been much better off holding Monero than Bitcoin.
You also need to first acquire Bitcoin non-kyc ON TOP OF Coinjoining/opening LN channels etc, so that's kind of a moot point. You don't need to swap from Bitcoin either. You can buy Monero directly with fiat or even swap from something like Litecoin, which is just as easy to get, and also avoid the expensive Bitcoin fees part.
No, not true, even with Bitcoin-like adoption transaction fees on Monero would still be very cheap because of dynamic blocksize. You might have short term fee spikes if it is sudden, but fees will always fall back down over time as blocksize adjusts to accommodate it. With Bitcoin, because of fixed size, sustained demand means perpetually high fees that increases forever as demand grows.