Like other commenters added: it's not the 737 that has been flying for 4+ decades, this is a new update to the 737 that has been flying for less than 2 years, this version has had 2 catastrophic accidents since its first delivery on May 2017.

Flying is safe because we had the time to learn from past accidents and create safeguards around their failures, this could be a new kind of failure we haven't been prepared for and if so there is a potential for risks higher than the usual.