PrincipalI agree with thekat03. I've watched many of this guy's videos. It's always from the perspective of "things to keep an eye out for" and WYSIWYG mechanically. He typically breaks down things the engineers did and praises or critiques their decisions almost as if he's a high school principle wondering how often he's going to see that student in his office.
I watched his review yesterday since I just bought a 2025 MME GT. His emphasis seemed very much from the perspective of someone who bought a 2021-2024 MME. He's already taken a look at both the Ioniq 5 and Model Y. If they reduce the hoses and improve fluid flow in the model refresh, he'll sing it's praises. But all in all, he gives his perspective as a mechanic and what he sees as potential problems. It's up to the viewer to figure out whether that information sways your purchasing decision.
The environment for under the hood applications of plastics on ICE is very harsh. The chemicals, hydrocarbons, heat are extreme. Plastic chemistries are chosen to withstand that environment. It's safe to assume Ford is using same materials for the MME. Using those chemistries in an EV application, all should be good. The 'under the frunk' environment is so much more gentle. Heat given off on ICE is hundreds of degrees F. The coolant (and plastic pipes) are managing to keep that at boiling. The heat of the high voltage battery is barely 100F. The reliability testing has to give better results on an EV. I heard nothing from this youtuber as to why the failures would be more (other than the extensive mechanical connections - but Ford's got those figured out - apparently since they've been using them since 1969 mustangs).That Munro attempt at hysterics was all that much justified. As I remember they are not operating at high pressure, nor do they figure very highly in the faults we frequently discuss on this site. Good plastic can have a long lifetime. And as well, they seem pretty accessible. Edit ps, read that 'not all that ...." grrrrrrr