In 1940 what other single engine bomber without fighter escort would have done much better?
The big problem with the Battle was that the requirement was at fault; a single engine day bomber flying at medium altitude straight and level over a target in broad daylight was asking for trouble. the day bomber requirement was like other British pre war ideas that in reality of combat proved to be non-starters, such as the bomber transport and turret fighter.
Marcel Lobelle's Battle was actually a well built, beautifully designed machine that was very advanced when it was first conceived, which led to large off-the-drawing-board orders. It was apparently pleasant to fly as well, being stable and responsive. So, in reality it fulfilled the requirement excellently.
It took a while before the RAF accepted the ground attack role, even preferring to call it "Army Co-operation".
Anyhoo there's a new thread to duscuss such things as the worst piston engined bomber of the war, now...