Hey Daniel,
Why do they not recommend a spindle? A spindle (an induction motor) is in many respects far superior to a router, which is a universal Motor with carbon-brush commutator. Induction motors are the workhorse in the industry, because their excellent performance/price ratio, longevity and power efficacy (see also: Differences between router and spindle).
Could it be because they want to sell their Carbide Compact Router and Carbide ER11 Compact Router instead?
What does not work?
By the way, a 65 mm spindle deploys much less mechanical power at the end of the shaft (at the bit) than a 80 mm spindle, with the same electrical current.
True ER collets are far superior to the proprietary Makita hand trim router collets, because the latter hold the bit only at the end of the collet, which leads to issues with the bit sliding inside the collet during operation (thus runining your workpiece). See here for comparison. This issue has led to frequent reports of wrong or varying depth of milled pockets.