I use a belly length putter, but don't anchor it. I did anchor when it was OK by the rules, but found it very easy with adjustments to keep using the long putter. I did adjust my putter for the adjustments I made. The challenge was to create the lie angle desired with the shaft I wanted to use. I came up with a solution which works well and is reasonably easy to do with the tools I have.
For me it was always about standing taller with an open stance to improve vision and a longer putter to smooth out my stroke as I tend to be a "hitter" with the putter. A longer putter facilitates this, but it requires a more upright putter with a head weight to balance out the increased length. It is easy to use this type of putter without anchoring, but still separate your hands in the stroke if you wish.
Personally as I have grown used to the feel of this type of set up I find it much easier to be consistent with both my line and distance. However, it does take a period of adjustment.