Soft hands tend to throw some blackjack players off. Most tend to play them as if they were hard hands. Sometimes this works and other times players are not playing their blackjack hands to the greatest advantage.
And you should want the greatest advantage.
Even if a player is playing according to basic strategy the casino will still have the advantage. It does not matter if you are playing blackjack online or in a brick and mortar casino, the house will still have around a 0.5% advantage over you.
And because they will always have the advantage over the player (other than skilled card counting players) you should always want to play your hand to the greatest advantage in blackjack.
Stiff hands and soft hands are the hardest hands to play. There is nothing you can really do about stiff hands other than play them according to basic strategy. But soft hands do not have to be played like a hard hand