The real advantage to me is rigidity. A trim router when the day is done is just a trim router. It was newer engineered to be a spindle and it’s duty cycle was never meant to be used more than a few minutes at a time. It’s shaft is using either bushings or low cost bearings and you won’t find more than 2 in any trim router. The fact that many can get by with this setup amazes me.
If you want to cut soft metals, something a trim router was never meant to do, you will need to support the tool rigidly. Some have posted aluminum projects done with a router and to me, as a journeyman machinist, they look as if they were made by a hungry rat. Sorry no offence if you’ve posted.
Throw in the 1/2 inch capability and it’s win win. Half inch shanks are used throughout industry and are strong rigid tools. And even a low cost Amazon special will last a long long time cutting wood.