If everyone is gunning for L6 after 8 years or L6 -> director in 8 more years, then the culture will be much worse. Assuming the long-tenured senior SWE is actually a solid engineer but doesn't want to play politics or manage up as required for L6+, this was a person who made G a very pleasant place to work. I know many L5 like this: smart, helpful, and made excellent colleagues.
That being said, I doubt it was mostly targeting people who were tenured too long without enough promos. My guess is these are people without the full backing of their upper mgmnt chain. Since even directors had no input into this layoff round, you needed your VP's support.
Added: maybe the person above is right since the grad changes are already moving G's culture into a more aggressive mode. G will slowly become like the other big tech companies (G will just pay slightly less since people will still have the outdated perception that the culture is better).
That being said, I doubt it was mostly targeting people who were tenured too long without enough promos. My guess is these are people without the full backing of their upper mgmnt chain. Since even directors had no input into this layoff round, you needed your VP's support.
Added: maybe the person above is right since the grad changes are already moving G's culture into a more aggressive mode. G will slowly become like the other big tech companies (G will just pay slightly less since people will still have the outdated perception that the culture is better).