~snip~
It has more to do with the weather conditions. During the summer season, the temperature in England is mild and there is a lot of humidity. It allows the growth of grass. Also, the conditions create more swing in the air as well. If the curators make it very very flat, then we may get a pitch that supports neither the seamers, nor the spinners. Else, the pace bowlers will get a lot of support.
Yes, Excatly.
That's where curator comes in play. if they can leave little grass on the pitch then we can expect competitive contest between bat and ball. Winning the toss can play big part here as well.
For example : Ball performing tricks during the first 10 overs then batsman need to show grit and determination to survive first spell, swing bowler and specially left arm swing bowler could be lethal. after that pitch will become easy to bat on. but on flat pitches (not dead wicket) good wrist spinner can do wonder if batsmen not taking him seriously.
The longer you bat-stay on the pitch, it gets more easy to bat on during the middle overs.