Just a fantasy of an ideal Logitech product lineup where all the unexpected hits/classic shapes finds their place in it.
G102 -- MX300 with AM010.
G202 -- LMO with AM010
G3xx -- Always been a lineup for experimental/novel shapes, so retaining the current lineup makes sense.
G403 -- G402 shape with 3366, essentially a minimalist version of G502.
G5xx -- is designated for Logitech's all-in flagship models, so leave this open for whatever they'll come up with.
G6xx -- has never been consistent in their designation. Better kill it off.
G7xx -- have traditionally always been designated for wireless g-mice.
G802 -- MX518 with AM010. Designate this lineup to keep the classic MX518 shape forever, with incremental sensor upgrades.
G903 -- G9x reboot with 3366. Just skip G902 altogether.