Eh, to an extent. During T8 all of the T7 content was still relevant for pre-Ulduar gearing as the only new badge gear came from Ulduar 25/VoA25. It wasn’t until ToC that the shift to Run 5 mans>jump into the hot new raid took root, and even then ToC 10/25 were still extremely popular through the remainder of Wrath as easy gearing for ICC.