ElectroNautilus' Lane Phase dominance has made Thresh, and especially Blitz, Obsolete in my opinion
I honestly believe that you could remove nauts "e" ability entirely, and he would still outperform these champions.
Electrocute naut is out-damaging basically every adc in the meta right now at levels 2-5 (and especially out damaging thresh and blitz)
His hook is near impossible to miss compared to blitz and thresh
his w, and late game hp scaling, allows for full damage rune page early, and a great tank late game.
His auto attack root keeps him completely viable/strong after engage. Flash autos for roots while im on full cooldown is my bread and butter with naut. ("cooldown worthlessness" is something thresh, and especially blitz suffer greatly from.)
his ult trumps both thresh and blitz' at every stage of the game, and cant be missed.
I just dont see myself taking blitz/thresh for the over wall hook, (nauts hook peels/chases) Or thresh for the lantern, as these are no way near worth the trade in his lane dominance.
Taking naut bottom is almost free firstblood at this point, rush level two and engage, the enemy lane will be crippled/killed 95% of the time.
Tldr: i dont see why youd pick thresh or blitz in any circumstance over nautilus.