Well, Pujols is obviously a bigger problem. At elast Trout is playing flat out great baseball commensurate with his salary.
But like with the Angels and Pujols, the Sox already have that one monster deal on the books. Actually more than one in Price, Sale, and Eovaldi, as Hitch pointed out.
This is exactly why I hated the Price and Eovaldi deals at the time and was very vocal about this. (I only liked the opt out in the Price deal, but he did not exercise it.)
So say the Sox add another monster deal in Betts, there will be ramifications. What happens when Devers is ready for free agency? The Sox have already committed $47.5 million to 2 players in Sale and Bogaerts for that season. Add in another, say, $35mill for Betts and you have roughly $82.5mill, or about one third of today's budget on 3 players with 23 roster spots to go. What if Devers also wants Betts' money? What about other free agents between now and 2023? Can the Sox be competitive with Bogaerts, 33yo Sale, Betts and Devers making, say $110-115mill combined? Can they afford any pitching or will they get anyone good from the farm? They still have 22 roster spots to fill.