I thought my steel frame could handle being spread from 130 to 135, and I didn't need to worry about bending the dropouts so they were vertical. Worked for about 6 years, then the frame broke.
Next I swapped a 135 wheel into a 130 frame, without spreading the frame. Worked one or two years, until the dropout cracked.
Slow learner, but I can learn. Now I try to match hub width to frame width.