I think there are multiple reasons for it:
1) We have the world cup and wimbledon at the same time
2) This is the least important athletics championships for european athletes. In my opinion the U20 world championships later this year will be much more exciting. In my opinion there are no can't miss talents at the european U18 championships this time (no new Ingebrigtsen, Tortu, Duplantis and so on). At the U20 world championships we will have many talents who are already (close to) world class.
Especially from a german perspective there don't seem to be many great talents, overall i would say that the following are the most exciting talents:
Burgin (men's 800 m), Healy (women's 1500/3000 m), Ogchebie (men's high jump), Mahuchikh (women's high jump), Lillefosse (men's pole vault), Nacheva (women's triple jump), Ivanenko (women's hammer throw), Andreev (men's hammer throw), Kokhan (men's hammer throw)
Personally i clearly prefer track events and in my opinion there don't seem to be any talents that could become world class (i know too early to tell), so i am naturally less excited this time than i was in the past. Top talents like Seedo or Arneton are missing as well for some reason. In addition to that i don't like to see russian athletes being allowed to compete.
I don't want to be all negative, so i am gonna say that in one way U18 championships are the most spectacular championships, because they are least predictable. Some girl with a 11.60 s PB at 100 m who was only 5th on the entry list can suddenly run 11.40 s and win the gold medal, you don't really get that at senior championships (hopefully). For me as a fan the most important thing is not to see medals but to see athletes performing at their best or even improving their PB and that's what you will see a lot at U18 championships.