Why should it be harder when we can all start on the same ground and then our actions decide our victory? Why can't you set-up sand storm and then SR?
I don't understand where are you getting with this fairness isuue.
Absolute fair battles don't exist.
And when i say fair i mean battles in which if the players skill is the same then each player should have equal chances of winning.
If you are going to ask why can't we start on the same ground and you accuse weather of not letting you do so,then i am going to say that many there many more things that prevent you from starting on equal ground than just weather.
If you are asking why no turn is required to setup the weather,then i can say to you why no turn is required for many other important aspects of the game like Leftovers,Intimidate,Natural Cure,
etc.
Leftovers makes pokemons much harder to kill,Intimidate lets powerfull sweepers like Salamence and Gyarados setup much easier and finally Natural Cure lets defensive pokemon wall much more easily.
So do they have an unfair advantage just because they don't spend a turn to heal life,heal status or ease setup?I don't think so...
If you are saying that Weather prevents you from starting on the same ground with the opponent,unless you are prepared of 'course,then i can also say that SR prevents me from starting on equal grounds with my opponent,unless i am prepared for this of course.
So both cases require preparation and both cases bring huge disadvantages for the unprepared players but why is weather so different to you?
If i built a team with many SR weak pokes and have no spinner,then i will be at a disadvantage against most teams.
If i built a team with no weather-good pokes i will be at a disadvantage against against weather teams.
There are also many more things that prevent absolute fairness on the metagame.
For example when Thundurus,Excadrill,Landorus and Volcarona are the premier sweepers in the tier every other sweeper is at a disadvantage if equal skill was involved.
And when i say that every other sweeper is at a disadvantage i mean their team.So for example if you could build the perfect team with Thundurus or Lucario(special sweepers),which one would you chose as a competitive player?
And this happens because all these sweepers are the best in what they do in ou!!!
Of 'course there are other sweepers that can work better in some circumstances but for most cases these are the best!
The same goes for weather!It is one of the easier and strongest strategies around(not always but in most cases,see sun)but does this make it broken?
Of 'course no!
In a competitive game there will always be prevailing strategies.
Like weather,SR etc.But this doesn't meant they ruin the game.
This means they make the game.
Everything revolves around them and they dictate the shape of the metagame!
So if something is not broken but seems very annoying and unfair then just get used to it and learn to deal with it.
Or finally as Glen said if you really don't like this metagame go and play Ubers,UU,RU,LC or NU.
There are so many different gaming enviroments to give you what you are searching for,yet you are insisting on playing and trying to fix only one,one that you don't even like in the first place...