Maybe you mean there should not necessarily be a peg? Sure, but then it becomes just another altcoin.
There simply is no peg.
The SC contains bitcoin.
This is not a peg, it is a conveyance.
These are different things, and you ought not confuse people by equating them. It runs counter to your goals.
Not true.
The unit used in the SC is technically not the BTC.
The BTC is not moving around the sidechain, the scBTC unit it represents is.
You don't like the word conveyance. OK
BTC don't really "move" either, you like the word "represent".
The point is the same though. It isn't a peg.
And...that's a good thing for SCs.
I like conveyance better than represent, because the scBTC does more than represent BTC, it wraps the currency in a different block chain with different characteristics. Like putting it in an envelope for more privacy, or to a fast block chain, or to use BTC as the "backing" for a special purpose currency (like a redemption value in a store issued coupon that is worth more BTC if the SC is spent in that store before the expiration date, and after is worth only the BTC value by redeeming it back to the Bitcoin block chain).
The BTC<->scBTC trades will have to gain value to someone in BOTH directions or they just won't happen. Someone would have to have a reason to move to a SC. And then they (or someone) would have to have a reason to move back to BTC. These may not be the same reasons as illustrated above.