Great move by the Lakers. To win a title requires top 5 players, usually teamed up with other guys who are at the very top of the league. Of the six pieces traded, only two had significant value, Ingram and the number four pick. Everything else they gave up, Hart, Ball, expected late first round picks, are easily replaceable. Caring about giving up bench players is stupid, because now most anybody available will want to come to the Lakers.
Over the past 10+ years:
Boston traded seven pieces for Garnett, plus a top five pick for Allen. That led to a title and a very close miss. Boston later traded Garnett and Pierce at age 37 and 35 (Davis is 26) for four first round picks
Lakers trade two first round picks and four players for Gason (a couple years older and not nearly as good as Davis), to team up with Kobe Bryant and win two titles
Cavs trade the number one overall pick give them another star next to James and Irving -- and Davis is definitely better than Love
The Warriors dynasty was built on having up to four guys worth max contracts and two or three of the leagues very best players
Heat needed Wade and Bosh next to James for their titles. Ingram and the #4 pick aren't going be nearly that good
Davis is already a three-time first all-NBA. There is a very real chance he falls apart like Howard or Rose, or that he has already shown us his peak (like Chris Paul). But there is always a far better chance someone remains among the best in the league, as opposed to developing someone like that through the draft. One of the biggest ways this helps the Lakers is by making it so much easier to add the next star they want, or combination of shooters / defenders
Pelicans screwed themselves by not wanting to wait until July when the Celtics could make an offer. Boston has seven first round picks over the next three years, plus Tatum, Brown, Rozier, Smart all between age 20 and 24. Would have been very easy for New Orleans to have got something better with all of that available. If they were going to make the deal now should have held out for Kouzma, Ingram, and the #4.