They might be flying too close to the sun on this one. A lot of the IRS' "inefficiency" is intentional, so it can be abused by moneyed interests to evade tax without anyone noticing.

Fixing those inefficiencies would bring this problem to light and force them to deal with it. While it's not past the current administration to formally legalize it, it's still "stirring shit" for no good reason and worse than leaving things as-is where the evasion falls through the cracks.