What on earth are you talking about!?!?! The Boston Celtics and the Golden State Warriors ranked #1 and #2 in team defense rankings this season: https://www.nba.com/stats/teams/defense/?sort=DEF_RATING&dir=-1&Season=2021-22&SeasonType=Regular%20Season
On top of that, the Boston Celtics had the defensive player of the year: https://www.nba.com/news/bostons-marcus-smart-wins-2021-22-kia-defensive-player-of-the-year-award
If there were ever a time when the saying, "defense wins championships" was applicable, it would be this series. Don't get fooled by the fact that Golden State can shoot the lights out. They are very much a defensive team. Draymond even made the all-defensive second team this year. Klay is also a great lockdown defender (although still getting his groove back).