[Isofarro]

Only realistic if they were preparing for some sort of Man vs Computer tournament.

Computers don't play like humans, and they are consistent in their weaknesses as well as their strengths. As players are more exposed to playing against various chess programs, they learn what positions computers are not so good at (long-range strategical themes, beyond the typical move horizon). A local optimisation, of sorts.

So players start adopting an anti-computer style of play, which requires a different mind set to pull off. That in turn affects their natural style of play.

So I argue the opposite, for preparing for top-flight tournaments, players probably avoid / severely limit playing against chess engines, to avoid this natural anti-computer bias to their play.

Sure, the engines are good for checking variations and analysis, as an assistant. But not as a leader, nor as an opponent.