The filler over the fridge is good. Your next fridge might not be the same size. Also, fridges like to have space for ventilation around them although specifics vary.

The other fillers are there so that doors have room to open. Not enough is shown to guess if it's excessive. If it took 4 years to bug you, it's probably fine. :P

The filler pieces are so your cabinets function properly, so the door doesn't open into the other cabinet or wall/trim. Over the refrigerator, it is likely to avoid conflict with the refrigerator hinge, which extends above the height of the case. As for overlays to bring the level of the fillers up to that of the door, sure, you could have them made; it's just a panel of wood the thickness of the doors attached to the cabinet frame. You might even be able to make them yourself depending on your DIY skill level, just make sure to use cabinet paint not wall paint.

Filler panels should match door finish?

Yes, fillers are normal. Especially in the corners where you now noticed the 3” one. The doors need room to open, it’s that simple.

Yes, yes, yes, on fridges being different sizes. Our refrigerator options are extremely restricted because our floors slope and someone hung the cabinet based on the the front, so one of the back corners only has 68 5/8" clearance floor to cabinet for the case. (The other back corner has a block of wood under the fridge, lol.) We had to toss out most of the options because they were 68.75" or taller to the top of the case. If there were a filler piece, we'd have just cut it to fit and keep many more options on the table.

"Filler panels should match door finish?"

It depends on the cabinet style. Full overlay cabinets have doors that cover the frames completely; partial overlay cabinets have doors that sit over the frames but don't cover them completely; and inset cabinets have doors that sit flush with the frames. With partial overlay or inset, the filler is just part of the frame. With a full overlay, if the filler doesn't come up to the level of the door, it would be the only part at frame level. That's not necessarily a problem, but if one wanted everything flush, similarto the look of inset, one could add trim pieces to the fillers in order to bring them up to the level of the doors.

Fillers are necessary, even for custom cabinets, if they are full overlay or frameless because walls are rarely square or straight.. Only inset cabinets can be scribed to the wall. You probably could have got away with a 2" filler in the corner, but if your hardware wasn't chosen when the cabinets were, they probably decided to err on the side of too much rather than too little.

Are you asking if you should have an overlay over the fillers so that they are not recessed from the face of the doors?

I would say no to that. (in the case of the fridge, if there were an overay to the filler- that would then be proud of the end panel and that would look goofy.)

Your cabinets look well done - square, neat and with attention to detail.

“Should” was a design decision 4 years ago that you didn’t even see, or notice. . You’re not getting free cabinet components at this very late date.

I typically use a 1.5" filler between cabinet and wall; the 2" filler you have is perfectly acceptable. I typically use a 3" corner filler like you have. I never have filler over a refrigerator. I would have customized the cabinet to be taller. But it's not incorrect, just a design decision. I rarely use overlays on my fillers. You cannot place one over the refrigerator because the panel on the left is not pulled out to accommodate one. Fillers are used with custom cabinets. What you have is not wrong.

Thank you!

Overlay fillers are completely optional. I think your kitchen looks fine without them!

Patrick, I think it looks great as is. If it took 4 years to notice, I would not worry about it. FYI - We lived in our new build home almost 2 years before noticing that cabinet trim was missing. Builder came and fixed it, but there were actually 5 people in that kitchen every day and no one noticed.

I have full-overlay cabinets. I chose not to request filler overlays (optional), because I didn't want the "totally" flush look everywhere. I think your cabinets look great as is. In your case, the fridge would look odd with an overlay under the doors, since your side panel does not come forward enough to box it in.

IMO whay you have is just fine