Anthony Davis is an analytics dream - highest PER, statistical juggernaut.
However, he has never played a full season of basketball - always injury prone, never healthy.
He has also never led his team to anything meaningful in the playoffs.
To put it brief - he is not a player that you want to mortgage your entire franchises future for, especially if his agent is intent on him only signing a 1 year deal. If a team mortgages their entire future to trade for you you, the player should also step up and sign a long-term deal. By Anthony Davis insisting on a 1 year deal - he has an easy opt out should the situation with the Lakers get messy. Which means that in 2020, teams can sign him outright.
Although the off-season hype for the Knicks has so far been very disappointing -- from losing the chance to draft #1, to Durant getting injured and Kyrie leaning towards Lakers / Nets -- it was wise for the Knicks not to give up on their young core ( and #3 pick, i.e. RJ Barrett ) for a guy that is non-committal like AD.
AD signing with the Lakers is reminiscent of Carmelo being traded from the Nuggets to the Knicks - Knicks mortgage their future for Melo even though they could have signed him in the offseason (i.e. AD insisting on 1 year deal). Also Knicks may have a player with similiar skillset in Mitchell Robinson.
All in all - applaud the Knicks front office for being patient / sensible - you mortgage your future in legitimate franchise players (i.e. Kawhi, Lebron, KD ... not players who have not proved anything in the league aside from PER like AD ). Yes the hype of the free agency has died down, but the best way forward to build a franchise is continuity and investing in the building blocks.