It is always a matter of taste, but there are also things that we do that can affect the overall look of the house. In another thread he posted other pictures. There you can see that this is a side entrance garage. The rest of the face of the house is back further when you look at it from the street. You are already fighting the fact that the garage is more prominent than the house. Second, there are more trees to the left making more shade at the main part of the house. That means more light hits the garage and makes it visually advance even more. It makes curb appeal a little more difficult than many other situations. If you stick a tree, even a top grafted weeping cherry in the center it will mimic the peak of the roof which will make the garage even more dominant than it already is. It is like wearing a big pointed hat and having someone sit in front of you and point at it. That is the problem from the street. The other problem is the approach on foot. Everyone has to go from the driveway, then along the side of the garage without even seeing the front door until you get to the corner. On the one side of the walk you have a big garage very close to the walk (maybe a 5' bed). On the other you have a sloped lawn going downhill. It is not the most comfortable walkway situation just based on that. If you stick a tree in the narrow bed along that walk, it will be even less comfortable because it makes you feel like you should move out farther, but you can't. Probably why the homeowners want to yank that ornamental grass. I'd put a medium sized shrub in the middle, maybe even a triangle of three, and infill the voids with some smaller fillers. I'd leave the Albertas. The most important thing is to make that walkway comfortable and keep the pedestrian focused on getting to the corner and seeing the rest of the house. You don't want to make them stop and look at this bed. You just want something pleasant for them to pass by. The goal is to get them past this space. Yes, that is one person's opinion. Hopefully the explanation will get others to think about why they recommend what they recommend. If they explain their reasoning, we can all learn from it whether we agree or not.