People are used to approximations, but they are used to decimal approximations. "I can't represent 1/3 as a decimal" is expected, "I can't represent 1/10 as a decimal" is surprising.
Making computers use more memory, use larger chips, and consume more power just to make one thing easier for novice programmers is a bad trade-off. Decimal floating-point types could be implemented in software for those who really want it.
By that reasoning we shouldn't be using higher level languages like Python and Java that use more memory, and consume more power for the same workload as code written in assembly. 6502 assembly FTW!