I don't completely agree with this, Because winter in Qatar lasts for 3.1 months, from December 4 to March 8, with average daily highs below 26°C. The coldest month of the year in Doha is January, with an average low of 14°C and a high of 22°C. So this can benefit many countries competing for trophy.
The influence of the weather or the environment will not have such a big effect on all players from all countries, because everyone also knows how the conditions in Qatar are every year. Because everyone can see and conclude as you conclude so that players from all countries can immediately prepare themselves so that they can still perform optimally in any condition.
Yes of course, because the planning team from FIFA had planned it carefully in advance, however, unexpected things could happen at any time. Addition, maybe this information below could be more convincing.