De-emphasizing functional operations makes it more likely for libraries to work in a non-functional style, for tutorials to do so, etc.
It's tiring fighting against a community and a (benevolent) dictator that disagree with you.
That summarizes the problem I guess :D
Actually only one line of code is enough for each of map/filter:
def map(fn, seq): return [fn(each) for each in seq]
def filter(cond: seq): return [each for each in seq if cond(each)]