This is very true. I play a lined Rob Allen Mouse and most of the bass lines I write and play are up the dusty end around the twelfth fret. I tried several fretless basses over the years and never gelled with them, the RA Mouse however was perfect. I think the whole ‘lined/unlined position of dots’ is set by how these things are on the fretless you start on. There are very strong opinions on all aspects of fretless basses and the playing thereof but I suggest reading them and playing them in a way that suits you. I agree with everything @lownote12 says about fretless and I always read his comments, particularly on fretless, with immense interest, however I do the opposite to almost everything he suggests just because I started off playing one (foolishly) without any advice. I play some of the songs in our set with slides, some without, depending on what I feel appropriate to the song, but then I’m a huge Mick Karn fan so I’m going to slide a bit too much. All I’m saying is don’t think there is an absolute right or wrong way, play it how you want to. I play fretless how I want to, in a way that suits me, but I also keep an eye on the stuff far more experienced fretless players, like @lownote12, suggest and I found tons of it really, really helpful but some people (absolutely not @lownote12 I hasten to add) will tell you that there is only one way to play and anything outside those parameters is wrong, that’s nonsense. Take good advice, sure, but play fretless how you see fit.