Fair questions.
Problem is there is a lot of misinformation out there and I think a lot of experienced gardeners see it wrong, for instance they equate manure with chemical fertiliser, which does indeed leach, its great weakness.
What do we mean by manure? I use the word for older, composted, dark manure, not fresh faeces from which the nutrients can be leached, to some extent anyway, which is why dairy farmers treat slurry like a nitrogen fertiliser.
The point in organic gardening is to spread older, composted (not necessarily perfect) manure and compost, which HOLDS ONTO ITS NUTRIENTS UNTIL WARMTH AND ROOTS CAN MOBILISE THEM.
All my experience points to this, and although a few nutrients may be washed out, the main part stay.
How otherwise could I be showing pics on this site of such abundance? I use no other fertilsers, organic or whatever, except some very occasional rockdust and seaweed.
Some of the problem here is language and for anyone else who is confused, be clear yourself and ask what other people mean by "manure"!
Your second point is also a question of language, I mean more that certain seeds and seedlings may struggle in lumpier conditions, but all vegetables should thrive in your beds, once they are underway. Giving advice here is tricky as I cannot see your beds and your manure and in fact the surface may be suitable for sowing everything, especially after the frost.