Whether or not the case is likely to fail during the upgrade. I guess age has a bearing but whether it is just age or something in the construction of older versions.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).