I think we overachieved last year mate. So many last minute winners and late turnarounds. It would be very complacent to go into the new season without at least of new players. They say if you stand still you go backwards and this would be true in my opinion. Yes we have a decent squad but I don’t believe it’s a title winning squad. Players like Robbo, VVD, Salah and Endo are in their 30’s and another year older and many of the younger players (eg. Szobo, Nunez, Gakpo, Diaz) have so far proven to be inconsistent . It would be foolish not to strengthen, particularly with an extended Champions League format this season.
I agree with you to some extent, we do need to always look to strengthen the squad; IMO a defensive midfielder is a priority with CB, LB and RW areas we could also look at.
But the squad we have now is very good and is likely to improve this season. We went into last season with a relatively inexperienced squad and had significant injury issues. I think probably only VVD, Mo, Robbo and Endo are at the age when we would expect them to have a decline in their abilities. The first 3 have obviously been very important in our recent success.