Now, as the work-from-home experiment stretches on, some cracks are starting to emerge. Projects take longer. Training is tougher. Hiring and integrating new employees, more complicated. Some employers say their workers appear less connected and bosses fear that younger professionals aren’t developing at the same rate as they would in offices, sitting next to colleagues and absorbing how they do their jobs.

Months into a pandemic that rapidly reshaped how companies operate, an increasing number of executives now say that remote work, while necessary for safety much of this year, is not their preferred long-term solution once the coronavirus crisis passes.

“There’s sort of an emerging sense behind the scenes of executives saying, ‘This is not going to be sustainable,’” said Laszlo Bock, chief executive of human-resources startup Humu and the former HR chief at Google. No CEO should be surprised that the early productivity gains companies witnessed as remote work took hold have peaked and leveled off, he adds, because workers left offices in March armed with laptops and a sense of doom.