Swept wings will lead to a higher AoA to achieve the same thing, so that is part of why the deck angle is higher on a swept wing aircraft even without LEDs.
Aircraft without LEDs are known as "hard wings" in the industry, and those with as "soft wings". A bit of interesting info for you:
There has NEVER been an accident due to inflight icing or failure to not get deiced prior to departure in a soft-wing aircraft.
(Before you point to Air Florida, that aircraft would have flown if they had tried adding more than 60% thrust. Doubtful it would have cleared the bridge at that power setting even with totally clean wings.)