I don't disagree at all. My point is those strikers that you named didn't do the things they are doing now or have been doing years ago. It's all part of developing their game, getting to the point where they become as much as complete striker as possible. Will Werner develop his game to become more complete? Only time will tell.
But you also gotta ask, are we playing to Werner's strengths to allow him to do what you said there? Have we been utilizing him properly (at least pre-Tuchel)? Liverpool, at their peak, play at a high intensity, get the ball forward quickly to Salah, Mane to do damage before opponents have the time to settle into their defensive shape. This season, we're seeing the problems they have breaking down teams when they aren't at their peak, when their play is slower and more ponderous (as seen by their recent home defeats). Even Mane and Salah have had their droughts of sorts (though not as long as Werner) this season. Our play under Lampard were ponderous and slow at the best of times and it revolved around spamming crosses to Abraham/Giroud. Not easy to create chance for yourself if the play is generally slow, allowing teams to get back in shape and you don't have much space to create anything yourself. The play under Tuchel has been better but for one reason or another, it's still not clicking for us in attacking wise. Fabregas once said this of his partnership with Costa.
Other reasons as to why he doesn't fashion chances for himself consistently could be down to (a) not being comfortable technically, something you mentioned above, (b) lack of confidence - destroyed by his misses, usage under Lampard, (c) adapting to the different kind of teams and challenges in the Premier League (teams in the Bundesliga generally play the same way across the table).
I don't think he's turned into a bad finisher all of a sudden because he didn't score 90+ goals for Leipzig in four seasons by accident. But I guess there's a difference between being clinical in the Bundesliga and being clinical in the Premier League? In the Bundesliga, he can get 5 chances and score 3 but miss 2 while in the Premier League, he gets only like 2 chances and misses both. This goes back to the volume shooter point I was talking about I guess. There's maybe more pressure inside his head now, knowing he gets very few chances to score now compared to at Leipzig and knowing he has to put them away. I don't know.
On a slightly different note, I also think he has been cursed or the football gods are not a fan of him. I mean, you can point to bad finishing as the main reason for his poor goal return since late November but it also feels like he hasn't had much luck when the drought has been as long as it has. He's hit the woodwork like 5 times in the Premier League this season (IIRC) and has had goals ruled out stupidly (at Liverpool) or for the narrowest of offside calls (at Leicester). I know these things feel superficial or whatever but the narrative around him could have been different had some of those moments gone his way.