The main problem with a multitool is the shape, powersource and strenght of motor.
For freedom, it's batterypowered. But for real staying power it's cord.
For fine work, you need a light small tool, but that precludes high or staying power.

Shape in another matter. Try to drill a hole with an anglegrinder fitted with a chuck.

In short, a real multitool will be like a swiss army knife. It can do the job, given time and effort.

Also , I agree with Gary. Even the high end brands of powertools are getting way to cheap and flimsy in the bodywork.
For example, I use a 20 year old Makita "nibbler" to cut sheet metal, and except brushes and cutting parts it's rock solid. On the other hand, all bearingholders and main bracing are in cast ali. The head itself, bronze, cast iron and hardened steel.
The plastic body provides a good handhold and electrical insulation if something should go wrong. And that's about it.