Naw, advantage is god tier... lets say you are using a rogue with proficiency to sleight of hand, and mastery, and a +4 dexterity modifier... so you are already running around with a natural +10 lockpicking rogue
you rolling 2 dice is insurmountably better than rolling just one, as breaking a lock with a value of say, 20 is already 50-50 moreover a critical failure goes from a 1/20 chance to 1/400 which means your critical fail change is almost entirely negated. any trap with a DC under 10 will ALWAYS succeed. and succeeding doesn't consume your tools in BG3
if you are trying for a roll over 20, you can buff your character and still have a very good success rate. for example, I found the lock to the seal of lysander... this was on my first playthrough where I went in blind without seeing any guides, DC on the lock is 30 and a 30 with a natural +10 is still a nat 20, but I added a blessing for 1d4 and another buff for a +2 to a skill of my choosing. so my buff was +13-16 which meant I still needed a fairly high roll of 14-17 minimum depending on the D4 roll... but because I had advantage, I got through the lock on the second try.
Advantage is a god-tier buff regardless in D&D, if you have advantage on attacks, or your opponent has disadvantage on attacks, it makes a huge difference in battle... you have probably noticed the dice being green and red, and either missing alot, or hitting just about every shot. this is the exact same principle, but being used for a different dice roll. Because BG3 is a D&D Dice game at the base of everything you should know that everything is based on your dice, even when you aren't shown the dice roll.
now, several people compared a second dice to a +5 and a +3... these people don't understand mathmatical variables... consider the second dice to be equivelent to 50% of the required DC if you need DC10., than a +5 is the equivelent of the second dice. but if you need a 20, then a second dice is equivelent to a +10 bonus when the DC exceeds what your own dice are capable of, however, it still gives you a 10% chance to succeed no matter how difficult, which is a x2 bonus compared to your 5% chance of success without advantage on a roll that exceeds the value of your dice and bonuses.
ADVANTAGE IS ALWAYS BEST (because honestly, you aren't going to be choosing between gaining advantage and a +5 bonus early game, and late game, everything will be wanting that +10 equivelent)
