denzinho..............That's all very well, but what you fail to realise, is that Sam can see a grayling at 100 metres - without polaroids !!
Some of us have it, others, well, they just don't....
IF I know I will be fishing a certain swim in a certain fashion and my home tied hook length is ( more or less ) a 'given' then I may well place my No8 or 6 bottom shot(s) on this length before I leave home ( or the night before). This helps tremendously if fishing early mornings or in bad light and saves an absolute age of fuffing around on the bank.
Obviously it doesn't work if fishing ' straight through ' !!
I don't say it's ideal, but it does mean you will be fishing quicker and I think that is more important !!
Works for me .......................