I'll bite. This "1 years good performance" is a nonsense.
2015 - best RWC performer out of Lions nations. One bad invented refs call away from a RWC semi final while another home nation couldn't get out of the group stage. Glasgow win Pro12.
2016 - credible in 6N with narrow loss in Wales and rising up world rankings. Glasgow Pro12 semifinalists.
2017 - outclass Wales and defeat Ireland winning numerous one on one matchups across the field in both matches against players who are picked for the Lions. Rise to 5th in world rankings (well above Wales) and defeat a near full strength Australia away from home with a completely reserve backline (reserves at club level!).
To my mind the following are all better ball handlers and arguably overall players than some of the Lions selections and their form is evident given the 6N and June test performances.
Hamish Watson
Jonny Gray
Finn Russell (outplayed Dan Carter, signed for Montpellier)
Alex Dunbar
Huw Jones (injured)
Seymour (Top Lions try scorer on this tour but still ignored?)
Hogg (didn't appear to be first choice before he got injured)
It's not whinging. It's just an objective appraisal that the Lions will squander a lot of their chances, like they have done in pretty much every game on this tour, because a bunch of quality Scottish players have been overlooked through a poor selection policy. With more Scots (and a willingness to play those that were on the tour) I'm sure the Lions would still have been heavy underdogs, but they might have mustered a bit more thrust in the opponents 22.
The bottom line is if you pick 16 players from the 7th ranked side in the world and 2 players from the 5th or 6th ranked side you are either:
i) not picking on merit
ii) conceding that the coach of the 5th ranked side can get more out of their players than you can
iii) both
To point that out as many Scots do is only giving a cool appraisal of the available information. We'll leave the whinging to those who have a problem with that!