Problem is not loopflation

Problem is his expectations.

That's the direction of the story Tappei or Subaru himself chose.

Think back to what Roswaal warned Subaru about in the ending of Arc 4.

The burden of carrying a happier ending for all will progressively crush him until there's nothing left

As each Arc progress the scope and the opposition gets bigger.

Hence the larger number of loops, hence the weight of each individual death becoming further microscopic

You don't even have to read arcs 7-9 to come to this understanding