Hi @Babakrad The Tab S6 was launched in 2019 and was elegible for 3 years of major operating system updates and 4 years of security updates. In formation from the the October security update https://www.sammobile.com/news/galaxy-tab-s6-october-2022-security-update/ Whilst it may be somewhat frustrating that the more powerful Tablet has not received the update the difference is that the Tab Lite was launched later. Four years guaranteed Tablet support started with the S8 range. https://www.androidauthority.com/samsung-android-updates
on the other point only Apple make iphones/ipads whilst a variety of Devices use the Android so updates may take a bit longer,Google Devices are the first in line. Samsung offers more customisation and functionality plus creativity at the higher end.
one comparison of the latest Tablets here https://www.tomsguide.com/face-off/samsung-galaxy-tab-s8-vs-ipad-air-which-tablet-should-you-buy
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .