I think, NO!
May be due to their Jahalat, ignorance, lack of will to accept & adapt to changing requirements.
Brother in case of all the brand new engines, especially the ones based on latest tech.; for normal driving conditions, you always start from the thinnest grade, mentioned and recommended by the OEM, in car's owners / users manual.
For 2NZ-FE (starting brand new), the recommended engine oil grade is 5w-30, and then 10w-30. Source: http://mywikimotors.com/toyota-2nz/