i have noticed a few things about hand smoothing that really dont work well.

1. it curves your hand to be competitive against the other persons deck and if your deck isnt tuned for low cost or high cost gameplay it forces your hand to have a bunch of ****** low cost one ofs or a bunch of land and spells you really dont need till late game. (playing combo against red goblins or mono red burn forces a midrange hand to be full of one cmc cards. playing midrange against ramp it forces your hand to be full of land and mana sources and no early game creatures because they are ramping to a bunch of large creatures.)

2. color fixing is based on both players colors and deck types not just yours and the opponents.
   (more times than i can count i play multicolor decks a lot and if someone is playing one of my colors the hand smoothing will imbalance the color focus to the other player and my hands will be reduced in those colors. i have noticed this the most with red and blue. if they are playing a heavy red or heavy blue deck they will get an unproportionate amount of those colors and i wont get any of those colors of land but a lot of those colors of cards. its like the hand smoothing is counting both decks as one game and one deck and is buggy so it splits them unevenly even while mulliganing.)

3. i have alos noticed the 3 ofs and 4 ofs always stick together. (for example etali's favor playing 4 it is fairly consistent to chain 2-4 etali's in a row. the card draw and hand smoothing are clunky and are making it to where 4 ofs especially are one right after another no matter what type of card they are and what their mana cost is. i think 2 together is normal but playing one etali and chaining into 3 others with a considerable amount of 1 2 and 3 drops is not cool. same with llanowar elves. i dont really want 4 llanowar elves in the first 15 cards of the deck 80% of the time and if i reduce them to 3 of i really dont see them in the opening hand more than 17% of the time and they always end up in hands without any green land.)

4. fabled passages and other search lands or colorless lands are not being counted correctly same with x cost spells and hybrid cost mana symbols.

(it seems like the hand smoothing is counting search lands as higher priority in the opening hand than multicolor lands. this goes back to the 4 ofs thing where the game forces clumps of four ofs at the beginning even though there are 19 other lands including untapped duals and pain lands the game forces the fabled passages and other search land 4 ofs to the front of the deck in large clumps.)
(the x spells tend to be counted as low cost cards and are forced into opening hands regularly even if you are only running 1 or 2. the proximity to the opening hand should be calculated based on average casting cost of the x cost spells. usually 3 or more so i think they should be counted by the hand smoothing as cards that equal 2 or 3 plus the regular mana symbols cost.)