For those unaware, the high altitude package no longer goes down to the 4x 20mm auto cannons but instead only to the 2x 50 cal guns.
I know the mosquitto isn't popular but it was one of my favorite to fly and the use of the high altitude package is THE ONLY WAY to consistently shake a fighter off your six. Bear in mind it has no rear turret like other bombers (I consider it a fighter bomber).
What you do with the high altitude is you get a fighter to chase you straight up into a stall, if they didn't have high altitude (not sure which german fighters do) they would stall out before you and as you did a flip right as you stalled you would turnover and be able to come back down on the stalled out fighter below you, turning the tide.
Without this, there is no reliable way to turn the tables on an enemy in pursuit, the light weight package may make you more manueverable but not as manueverable as a fighter so it's utterly worthless and the 2x 50 cal is it's own separate weapon and not linked in with the 4 existing lmgs making it very weak. So it's a worse choice in general to the 4x20mm autocannons.
My point in all this is that I felt the mosquitto filled a unique roll between being a fighter and a bomber but now it is crippled since choosing the 4 x 20mm cannons will mean there's no way (and it's a 50/50 chance you'll reach the stall before getting shot down to begin with) to turn the tables on a figher.
Why was this necessary? There's no point to the mosquitto now and you may as well fly blenheims as you'll be better able to defend yourself from fighters given the turrets. Why do hate fun DICE?