Reddit mentions of Sharpie Plastic Point Pen, 0.8mm, Fine Point, Assorted Colors, 4 Count

For me, the fineliners of any brand that are actually metal nibs do get a little scratchy but you just rotate the pen in your hand, like you do with pencils as they get blunt. You can't use too much pressure on them or use them up against rulers too hard because it cuts into the tip (and no metal rulers at all!). For me, the Papermate Flairs actually drag on the page compared to my fineliners which flow really nicely when you're on the right part of the nib. I actually like the Artline 200 Fineliner in black for my usual writing. Or the Papermate Inkjoy gelpens in the 0.7mm tip.

The Staedlers are a much finer point, I think they're 0.3mm when the Papermate Flairs are 0.7mm. So they're good for writing and small detail but you might want to stick to Flairs if you like nice bold lines for boxes and stuff. The Sharpie Fine Point that I use is 0.7mm but I know there's a Sharpie Permanent Marker that's fine point so I thought I'd link the exact one. The Artline 200 is a 0.4mm tip. So based on what you use and their tip size, the actual Staedler Fineliners might not be best for you but there might be some that are more what you like based on tip size.