People are talking about a couple lbs of lead, as if.... without it.... You'd be unable to arrest some sort of ballistic ascent.
Its well within lung compensation parameters. The buoyancy comes on slowly. Chances are you'd even barely notice it....providing, of course, you had a tiny modicum of innate buoyancy control.
Technical weight checks are based on minimum gas, not zero gas (... holding final shallow stop with no air in BCD). Finishing the dive neutral. The concept being that you'd never need more weight than that.
In tech.... You're likely to have multiple gasses in multiple cylinders. Total the number of non-related failures you'd need to experience for ALL your cylinders to be empty.. it's a lot. Actually....the chance of that outcome is beyond reasonably likely.
In recreational diving.. a single cylinder.... there is potential for gas to deplete. But that'd HAVE to coincide with large emergency deco for the situation to get critical. And you'd HAVE to have no team/buddy support. (and no personal capacity to cope with a couple lbs positive through breathing/buoyancy control).
That's also a string of worst case scenarios hobbled together....a solitary no-stop diver who somehow needs to desperately hold a stop until the very last gramme of gas is sucked out of their tank.
If that scenario happened, would their weighting really be their biggest failure?
To me, weighting for empty tanks seems like a part-understanding of tech concepts being incorrectly applied in a recreational context... leading to over-complication and sub-optimal results (too much weight carried).
Recreational divers can benefit a lot from adopting tech diving practices, but sometimes things get wrongly interpreted or applied.