Koolj isn't that strong in harder races? For now he is more of a pure sprinter, but the potential is there to be something like Phillipsen.
And you're right that there is fewer sprint stages now. But there is still enough to get some wins in GTs and the biggest one week races. But none of the more pure sprinters have achieved more than mostly victories in smaller races:
Dylan Groenwegen: One stage win in the Tour last year. His other wins are in races like Slovenia, Hongrie, UAE Tour and Saudi Tour.
Pascal Ackermann: One stage win in the Giro this year. Otherwise just victories in smaller stage races and one day races.
Sam Bennett: Two wins in Vuelta last year only of significance.
Caleb Ewan: Only some minor one day races, a stage in TA and stages in races like Turkey and Saudi Tour.
Fernando Gaviria: A stage in Romandie is only result of interest in 2022 and 2023. Really not many good results after 2019.
Merlier and Jakobsen is a bit better. And I would possibly consider Jakobsen or Ewan if the wage demand wasn't too high and it was a team that needed profiles and has fewer option in the GC or one day races. But no way any of the others.