Well when I think "what player would give this board a collective hard-on" Matthew Tkachuk would be very close to the top. It's funny how certain forums/fanbases kind of favor certain types of players. This board loves gritty skilled players more than Mike Smith (the GM) loved Russians.
I wouldn't say no to Tkachuk but a few things to debate
1. Eichel is just a flat out better player at a more premium position. Anyone who says otherwise isn't watching. Tkachuk is a good player, but he just is never going to reach the level that Eichel did in 2020. If you trade for Eichel there is Hart contender upside, not the case with Tkachuk.
2. Tkachuk is more of a position of need. He'd be the best winger the Kings have had since the lockout.
3. Eichel is signed long-term, Tkachuk isn't. To re-sign Tkachuk the Kings would need to probably offer him a similar AAV to Eichel.
4. Tkachuk is going to cost the same prospects that many of you are balking at giving up for Eichel.
5. Matthew Tkachuk has been in the NHL since he was 18 and has played a sandpaper style for 5 seasons now. Sorry but it's tough to not remember the names Richards, Lucic and Deadmarsh who played the same way.