I've done some new testing, with 7.3 about to go live next week. It might change if a new action priority list takes better advantage of the new talents but at least it gives people a insight into their decisions next week.
https://docs.google.com/spreadsheets...it?usp=sharing
Talent choices in 7.3
In Legion so far, the feral talent choice to pick was SR+JW+BT, the next nearest choice was over 5-6% behind, we had only 4 builds within 10% and the worse choice was a good 30% behind the best.
In 7.3 we have usually 9-11 talent builds within 5% of the best one. Its close enough that you might need to get into the habit of doing a regular test of all talent build choices, just like you do for stat weights. The worst build is now only 15% behind the best. The only talent that really hurts dps now is EG and maybe that can be used in some situations (pvp?).
For the majority of players, definitely everyone not doing mythic raids or over m+15 dungeons, a 5% dps difference, to pick the talents you enjoy playing is a worthwhile decision. If you do 1,050,000 dps with the best choice, you will still do over 1,000,000 dps with any of those 11 other talent build choices. Thats definitely smaller than the random variations from one attempt to another for most people. So be aware of the impact of your choices, but don't be afraid to make them.
If you a top end player, then Incarn + SR + BT is your best dps choice, you can swap BT for MoC for a tiny 0.5% or less dps loss. Other than that, not much has changed for you, the changes should give you a 1% dps buff and some quality of life improvements.
T75 SotF 2-4% loss (1% with EG). Smooth energy, slight dps loss
T75 Incarn BASE - Big swings in energy, best dps
T75 JW 2-4% loss. Tight energy (fun gameplay), slight dps loss
T90 SbT 1-2% loss. Very simple gameplay, slight dps loss
T90 BrS 2-3% loss. AOE heaven. Slight single target loss.
T90 SR BASE - Interesting gameplay, best single target dps
T100 MoC 1.5-3.5% loss. Easier gameplay, slight dps loss
T100 BT BASE - Complex gameplay, best dps
T100 EG 6-9% loss. Large loss - Fun gameplay, large dps loss
See the sheet for much more detail.