Using an estimate ensures that the answer is about right. With decimals where the decimal point should go is difficult for a lot of people, so an estimate of the answer ensures that it is put in the right place.
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It is not important for all. However, many people find it difficult to judge where the decimal point shuold go in the quotient and for them having an estimate can be useful.
in dividing decimals you never get a remainder and in dividing whole numbers you do. +++ More to the point perhaps, you are working in powers of 10 all the time.
A g
By the time you advance to the point of dividing decimals, you don't use remainders any more.
Yes
because you can always add a 0 when using decimals