Long-term TA - log charts can make more sense as they print equivalent vertical movements of price according to % change, rather than points or pips change. So a 100pt to 150pts would be the same vertical distance as 200pts to 300pts: same change in % but twice as much in pts.
If price is rising at a steady % rate per year, the price line on the log chart would be a straight upward slope: whereas without the log scale, the line would curve up over recent times and fool the viewer into thinking that the rate of price rise was increasing.