See that's where you are wrong. In saying that there are 3-5 guys that will become international stars. That's the case for leagues like the NLA and DEL that have little to no own player production, just washed up imports. With Liiga you must atleast multuoly that number with ten.
We can look at the top 10 Liiga scorers from five years ago (age at the time) and where they are now:
Henrik Haapala (22 yo.) 15+45=60 (Jokerit, KHL)
Veli-Matti Savinainen (30 yo.) 30+26=56 (Jokerit, KHL)
Mika Pyörälä (35 yo.) 26+29=55 (Kärpät, Liiga)
Tomi Kallio (39 yo.) 20+30=50 (
retired)
Ville Vahalahti (39 yo.) 14+33=47 (
retired)
Vili Sopanen (29 yo.) 20+26=46 (
retired)
Antti Suomela (22 yo.) 22+23=45 (Toronto Marlies, AHL)
Erik Thorell (24 yo.) 24+20=44 (Sparta Praha, Czechia)
Juhani Tyrväinen (26 yo.) 14+29=43 (Luleå, SHL)
Jaakko Rissanen (27 yo.) 9+34=43 (KalPa, Liiga)
Not really all that impressive, and the league is worse now than it was back then.
Best U20 players likewise:
Otto Koivula (18 yo.) 10+20=30 (Bridgeport Islanders, AHL)
Aleksi Saarela (19 yo.) 15+13=28 (Langnau Tigers, NLA)
Jerry Turkulainen (18 yo.) 9+17=26 (JYP, Liiga)
Robin Salo (18 yo.) 1+15=16 (Bridgeport Islanders, AHL)
Miro Heiskanen (17 yo.) 5+5=10 (Dallas Stars, NHL)
Otto Leskinen (19 yo.) 2+8=10 (Jokerit, KHL)
Jarkko Parikka (19 yo.) 1+9=10 (Ilves, Liiga)
Eetu Luostarinen (18 yo.) 3+4=7 (Florida Panthers, NHL)
Joona Luoto (19 yo.) 5+1=6 (Tappara, Liiga)
Urho Vaakanainen (17 yo.) 2+4=6 (Providence Bruins, AHL)
Heiskanen is a legit star in the NHL, and Luostarinen has become a solid roster player. But neither of them could contribute much as teenagers at the time. Two of the three young players that did contribute could subsequently also take the next step, but not to the highest level.
Also, imagine thinking that the amount of young up and coming stars do nothing to raise the level of Liiga, but the literally hand full of finns are the game breaker in favor of NLA..
Besides, infact, they are not better in NLA. I'll take guys like Innala, Koivistoinen, Kemell and Nurmi over senior like Pesonen and Rajala every day of the week and twice on sundays. Guys like Kontiola and Palola are Liigas version of Rajala and Pesonen. Decent, older guys.
Decent older guys with 2151 games of NHL experience, several World Champions among them and one Stanley Cup too. Filppula is past it obviously, but Vatanen and Rajala are only 30. Saarela is 24. To suggest that 17-year-olds and draft rejects (well, Nurmi 163rd overall) are better is absurd.
Pretty weak if thats your only argument ("better imports" and belittleing the fact that Liiga is on a whole other level as a development league). Dont even get me started on the level of coaching and domestic players. I am not holding my breath waiting for Switzerland to start winning gold medals from left and right internationally using only swiss coaches and players from the NLA.
One can question whether Liiga is still a serious professional league if it's main role is to act as a developmental league akin to junior competitions. In Switzerland there are many prominent foreign coaches like Grönborg and McTavish, but I don't see how that would be a weakness. Likewise native Swiss players with NHL experience like Brunner, Weber, Müller, Malgin, Díaz, Berra, Andrighetto are more prominent than about anyone in Liiga.
As for Barach I spesifically wanted to bring him up here as an example of a guy that you would be little, but who is infact a better import than many of the washed up guys in NLA and DEL. He is an up and coming guy, with future ahead of him, not behind. The next Justin Danforth, who I am sure you wouldve overlooked aswell when he firts cane to Finland.
Would be great if he can salvage his career, but he has a long way to go still before he can be mentioned in the same sentence for example with those Swiss players above.