First off, I love the picks of Smart and Young, both excellent choices who will be very good players. Looking at Phili's haul this year and last though, they are way ahead of us on building a contender. They have MCW, although not as good as Rondo, he is last year's rookie of the year who is also not hitting 30 and looking to leave if his team doesn't put vet stars around him.
Then the centerpieces of their rebuild, the twin towers of Embiid and Noel. What an awesome foundation to build around. We haven't been able to land a decent center for years and they have two of the best young centers in the league. Much better than the combo of Sully and KO in my opinion.
Next is Saric. Sure, he won't be in the league for 1-2 years, but he could be the most talented player to come out of this draft. He is at least likely to equal Smart, if not surpass him.
To top it off, with Embiid needing recovery time and Saric in Turkey, they will get another top 5 pick next year.
I'm not panicing, Ainge still has assets and the offseason is still young, so he may make some big moves, but I'm envying Phili's roster right now.
You could put this scenario another way: Philly was historically terrible last year and is likely almost as terrible next year. They have no veteran leadership, no culture of winning, and no veteran all-star types (ahem Rondo) that could be used as either a huge trade chip or to woo FAs next year.
Creating a long-term culture of losing is NEVER the best way to create a great team. Philly has made losing into an art form. If Philly was Smart, they would trade some of their future picks for some veteran help to bring create a culture of winning for Embiid, Noel and MCW.
On the other side, the Celtics have flexibility moving forward: expiring contracts, promising youth at every position, enough solid veterans to be competitive this year and enough future picks to make big moves one this core comes together. The idea that Rondo is guaranteed to leave is laughable given that the Celtics could easily make a big trade during the season or a big slash in free agency next year (which will be even easier if the Celtics are competitive this year).
If Sully loses weight to better his lateral movement so as to defend the 4 and KO bulks up a bit to become less od a defensive liability at the 5, the Celtics can give a lot of minutes to what was statistically one of the best offensive and rebounding duos in the league over the second half. It's not crazy to expect KO and Sully to both average 16 PPG and 8 RPG or more this year.
A healed Rondo + Smart's tenacity will be nightmarish for opposing backcourts. If Green just does what he usually does, that's a competitive team that can put out some interesting lines and create matchup problems against almost anybody. They won't win a championship, but they can certainly make things interesting.
Remember: the Celtics weren't a barren wasteland of talent and losing when they brought in KG and Allen. They were a mediocre but competitive team with an established veteran star, young talent and good coach.