8 signings? No chance. At best we can hope for 5-6.
Normally I would agree with you. And you probably
will be right.
However, I think United need more signings this summer than any other post-SAF. And even United can't cut corners on this one.
Look at who is leaving for (99%) certain - Cavani, Greenwood, Pogba, Lingard, Mata. (And Lee Grant)
Likely to seek transfers - Henderson, Martial, Bailly, Jones
Question marks - Ronaldo, Rashford, Shaw, Maguire, Matic.
So there's a good chance we will need a new backup keeper, or a ball playing one to compete with (or replace) De Gea. With Cavani, Lingard and Greenwood leaving, we will need at least 2 forwards. Elanga cannot be a natural starter and Rashford doesn't start much any more. If Ronaldo leaves, you can up that to 3 forwards needed at least. We need at least 1 top class defensive-minded midfielder as we cannot keep starting McFred regularly and need a long-term Matic replacement. EtH has always liked creativity in midfield too, McFred offer none. Ideally, we will need a replacement for Pogba too. I think EtH will be desperate to get some quality in right back as well, as full-backs are vital to modern football and United's are mid-table level, especially Dalot and Telles.
Simply put, I don't see how United can afford with having as few incomings as usual.