My sister-in-law (girlfriends brothers girlfriend, not that it matters) recently studied for a data analytics certification. Actually several. The entire course (located on here: https://medieinstitutet.se ) is based on Google Analytics. Now her entire value is tied to the use of Google Analytics, she will almost certainly fight very hard to ensure that these skills remain relevant, nobody would want to retrain for 6…
On one level it's an important observation, on another it's mundane: DBAs will fight one another over Oracle vs DB2 vs SQL Server. Traditional bare-metal DBAs will fight RDS. C programmers are upset by Rust. People who invested a lot of effort in shell scripting for SysV init dislike systemd or s6.