My Hanika is dotted at 5 & 7 and I'm used to it. When playing a gig on a friend's guitar without dots, I sometimes missed the correct fret when quickly changing from 1 to 6 or whatever. I think I could get used to a dotless fretboard after a few weeks as well, but - hey - I'm a heretic anyhow, playing Bossa & Swing on a classical guitar, so why shouldn't I have those devilish side dots? And after all, how could I get them off?
AND what about my other guitars (Manuel Rodríguez FF: 3+5+7+9+12). Some of my guitars even have markers on the wide side of the board (Framus Mayfield Custom: 1+3+5+7+9+12+15+17+19+21; Warwick Thumb Bass [26 frets]: 3+5+7+9+12+15+17+19+21+24)
In my opinion: it's better to build guitars with side dots as long as you don't know the customer. I think 5+7 is a good compromise. Maybe 9+12 as well. Dots can look very precious. My Warwick bass has got dots made of abalone in different shades of colour.
Nobody can earnestly say "This guitar is unplayable for me, because it has side dots". But there will be guitar players that are used to side dots and need them, especially those, who also play other types of guitar (electric, archtop etc.).