Is it not true? The first two games he played Maguire Martinez and Shaw, we tried to play out from the back with De Gea. Eriksen was up top for the first game because of no Martial. The second game with the same backline and Ronaldo up top we played a midfield 3 of Fred, Eriksen and Bruno with Fred at the base again trying to play out from the back and we got absolutely mauled.
3rd game against Liverpool we started McT- Eriksen with Varane next to Martinez and Malacia at LB with Sancho - Rashford - Elanga (very counterattacking front 3). Almost every goal kick we went long and we scrapped playing out from the back until later on in the season when we were in good form and had Antony/Casemiro and Shaw at LB - again even then it wasn't consistent throughout every game.
With the double 8 topic... don't forget how flexible Ten Hag has been. We've seen us building up in a 3-1, and in a 3-2 with a fullback dropping in. We've seen Eriksen drop into the backline (goal against forest away) with Dalot in midfield. Everyone will be rotating constantly. I think Amrabat and Mount will get an even share of games.