Lost wasn't a good show (from a writing, world building, acting perspective). Where Lost excelled was keeping people strung along an watching. It was a bundle of mysteries and intrigue and the fact that it didn't make sense didn't matter to the studio, execs, etc. because it was gluing eyeballs to the screen and selling ads. This is the legacy of Lost.
Granted Severance isn't ad supported, the concept is largely the same in that it keeps people subscribed for three months.
And admittedly Lost isn't even the first in this class of shows. Anyone old enough remembers the same phenomenon happening with shows like Twin Peaks. Hell, even the X-Files basically existed to sell perpetual mystery. BSG (2004) also fell into this trap.
Severance is pretty good. But damnit if they want to go down as an all time great show, they better have a plan. That might be at odds with the studio though, since they're optimizing a different problem.