Instruments- discuss specific features, luthiers, instrument problems & questions
I'm not sure if you mean a totally fretless fretboard or no half frets so I'll give thoughts on both possibilities. I've only played for 1 1/2 years. In that time I've experimented with noters in varying sizes and materials(wood, metal, plastics, glass). Throughout my experiments I discovered several things. I could immediately rule out a material by how well it slides. If there's too much drag it's out. If it absorbs too much string vibration it's out. I started getting frustrated and that's when I started hitting frets with my noter as I would slide. I had totally lost focus on how I was holding the noter. At that point I started reading about fretless fretboards. I decided against it because I realized the value of landmarks. There's a sweet spot within each fret to aim for. My current noter is a 1/4 inch delrin rod. I use a thumb on top index finger support underneath that slides along the fretboard. Fret bumping is a thing of the past!
I am a diehard diatonic player. My Dulcimer does not have 1/2 frets. I have over 100 songs in my personal tab library all either original DAA or ones I've transposed to DAA. I have played DAA on a chromatic instrument and was confounded by fret spacing.
It is completely logical to keep options open for tunings and or mode that 1/2 frets offer. And the flexibility while playing in a group is almost a necessity!