> gate fidelity and other parameters are above certain threshold

A threshold that might be beyond what the physical properties of our universe allow. It is still unclear.

This possibility means discovery of new physics that has no indications of existence yet.

This is what bugs me about both quantum computers and commercial fusion power. There's so much talk about how it's just inevitable and will happen soonish, but a lot of the evidence suggests, in some cases strongly, that it might not ever be possible.

I find it weird how bleeding edge research, at the very edges of both physics and engineering, is treated as though it's a market development about to drop. Possibly a consequence of pure R&D having all but died? Getting funded requires pretending there's a business plan for what you're working on?