JU88 was a horizontal bomber or did better then the 87Sorry if i was unclear,but i do not belive that dive bombers were magic cure.Only that horizontal bombers till heavy bombers come was waste of resources against any enemy with good fighters.
And becouse countries with poor fighters,like Poland fell quickly,after that anybody should made either dive or heavy bombers.
Preferable both.
Germany and Hungary could use medium bombers against soviets till 1945 only becouse soviet air force sucked.And even they used mostly Ju88 in dive bomber version.
Now,what italian dive bombers/some dive version of Breda Ba65/ could achieve ?
1.1940 - british had small number of fighters there,so they could act freely there.With 400kg bombs made from 320 schells they could not sink battleships,but carriers and cruisers are another matter.If british fleet do not widraw,they would be bloodied.
2.1941 - they could partially stop operation Compass,targeting british trucks.Tobruk would remain in Italian hands,and germans do not need send more then one dyvision there.
British navy fighters still sucked,so their fleet could do nothing - Malta would probably fall.And dive bombers get 640kg bombs,which mean pssibility of sunking battleships.
Which mean one more tank dyvision and Rommel against soviets - Leningrad could fall this time.
3.1942 - with more german resources on East,Stalingrad would fall and 6 army do not get destroyed.
Turkey joined war against soviets.
Italian with one german dyvision still do not take Egypt,and their dive bombers would face Spitfires.This mean end of their land career,but against british navy they still would do.
4.1943 - Germans ad Leningrad and Stalingrad, heavy fighting there.but till the end of year soviet would reclaim Don river.
Turkey fight in Caucasus mountains.
Italian start using new fighters/Re2005 etc/ with 640 kg bombs,efficient against allied fleet.Italy still lost Africa,but nothing more.
4.1944 - soviets come to Dniepr river,retake Leningrad.And most of Turkey.
Italy invaded and surrender,german fight there near Alps/american forces fighting better then in 1943 OTL/
5.1945 - soviet take Wisła river,Allies take all of Italy,Hungary and probably Bulgary.Maybe Constantinopole,too.War end with A bombs on Berlin.
Result - soviets take less in Europe/only Poland and Romania/ but get Turkey.And british navy lost more ships.War last 4 months longer.
Fun fact, a single30 cal machine gun is more then enough to kill a fighter. a 50 is even more... Guess what most convoys had with them? vehicles with that kinda weaponry. AAA was in use during the interwar periods, and dive bombers were only useful in areas with little to none, or in the pacific where you had to worry about other factors and weren't just on land. Dive bombers also carry 1to 3 bombs, where as light bombers could carry more of smaller bombs, and medim could carry even more.
Add in the fact that Dive bombers were worse against fighters then horizontal bombers