your point is good but again doesnt look at the full picture. although its true that as a sole anchor, FNS lack of firepower would be a glaring issue, BUT its important to remember that yay didnt fully make up for it, he wasnt a typical site anchor, he was setup on most rounds, he was use like a jett on defence on Ascent. He was setup aggressively to take shots and TP away, the same as a jett would. it also then resulted in having your smokes player as an anchor, hence, s0m. s0m on smokes can be just as good of an anchor as any sentinel, just think of s0m around yellow on icebox. Multiple setups on many maps dont require the sentinel player to be the anchor, icebox is one example, but on abyss and pearl, a lot of the sentinel setups can be on mid to watch to lurk spots.
ALSO, you are missing the biggest part of the current meta, as well as the direction the game is heading towards. The game is heavily retake heavy. How many times do you see cyphers playing of the site on Sunset or split or lotus. it is not that difficult for them to adjust their setups to have their smokes player be the anchor like many others do, and keep their sentinel players more passive and info gathering heavy
I will also keep saying this, you are certainly not the first to say that his fragging was gonna be a problem, for the past 4 years, people have said this exact thing, for the past 4 years people like you have also said that the competition was going to get too much for FNS to handle. For the pas 4 years, people saying this have been wrong, the last full year of competition FNS had was very good. He qualified to every international events as well as getting top 4 in one of them.
ive said this before, ill say it again, one day the doubters, like you, will be right, but until that happens, FNS deserves the respect he built over the years. Maybe this year will be the year where you are right, but just tell yourself that it will have taken 4 YEARS for people like you to FINALLY be right