Neither of these ideas seems credible to me. Whenever I’ve searched for the answer all I find is vague references to blue computer screens looking better in the shops, or that the blue colour cast suits graphic designers. They still have a colour cast, but it’s not as strong.
The only exception seems to be Apple Mac computers.
Most monitors have a strong blue colour cast. When monitors are manufactured, the colour is set incorrectly. If you undertake client work, or sell your photos through stock libraries, it is essential to calibrate your monitor so that you know the colours of your photo are as intended. If you don’t, the colours in your photos won’t be accurate, and you will never produce a print (or any other form of output, such as a Blurb book) that matches the colours on your screen. If you want to obtain accurate colours in your photos in Lightroom (or indeed any other software), no matter what you may read elsewhere, you need to calibrate your computer monitor.
