Ian Anderson admitted he feels uncomfortable reuniting Jethro Tull — for numerous reasons.
"It would be an awfully crowded stage," he told Classic Rock. "And in many cases those old band members no longer play and haven’t for many years. It’s a tricky one. I've always felt awkward about the idea of getting the old band back together, because which edition of the band are we talking about? Picking some people and not others would be favoritism. And I don’t have favorites."
https://ultimateclassicrock.com/ian-anderson-awkward-reuniting-jethro-tull/