Others have given the detailed answer, but the really simple one is this; “How many jungle plants grow well in deserts?” If it was simply a matter of “hot = good”, surely the answer would be “all of them.”

There are specific conditions that every plant requires to grow well. Some plants are more tolerant of disruption to those conditions, some less so. Climate change affects all of those conditions. Increased global temperatures can make some places hotter, some places colder, some places wetter, some places dryer, and have all sorts of other knock on effects too.