The pace of the Premiere League will catch him out?
At this point I'm really not sure you know who Timo Werner is (won't be surprising at all).
How many PL strikers are “technically strong”? Aguero? Auba?(maybe) Firmino? (definitely exchanging goals for technique that one)
To be a successful PL striker, you need movement and the ability to actually finish a chance. That's what make Vardy, Aguero,Kane, Ings (last season), Auba etc successful not how ‘sexy’ your passes look or how many men you take on before scoring. Movement, finishing and a reliable supply line behind you, that's all it takes. Technique, skill, passing range/accuracy, holdup play, aerial ability, pace, agility, strength etc.....those are just added bonuses that gives you a distinct advantage in CERTAIN match scenarios.
Werner has movement in and around the box and can finish (although still requires some work in being more clinical). Those are better indicators for success IMO than his pace.