While we're all entitled to an opinion, it's not an opinion that most championships are won by teams that build their core primarily through the draft.
STOMP
Yes it is subject to debate. Looking at the past 10 years of NBA champions:
2013 Miami - Nope. LBJ, Bosh & Wade super team.
2014 Spurs - Yes. Primarily drafted core.
2015 Warriors - Yes. Primarily drafted core.
2016 Cavs - Nope (or at least an asterisk). LBJ returns to the team that drafted him and teams up with Kyrie and Kevin Love.
2017 Warriors - Yes (but that Durant fellow added quite a bit to the core).
2018 Warriors - ""
2019 Raptors - Nope. Green, Gasol, Leonard, Siakam, Lowry ... only Siakam was drafted by the Raptors.
2020 Lakers - Nope. LBJ, Caldwell-Pope, McGee, Davis, & Danny Green. Not a single Lakers draft pick among the starters.
2021 Bucks - Nope. Giannis, Lopez, Middleton, PJ Tucker & Holliday. Only Giannis was drafted by the Bucks
2022 Warriors - Yes
So, pretty much the Warriors and Spurs had their core home grown.