Liverpool did missed most of their crucial players this season, but they got good replacement for them. Liverpool failed to qualify for the Champions League, whereas they were provided with a chance to finish in the top four. Liverpool will concentrate entirely on the English Premier League this season, with the ultimate objective being to generate excellent performances for the upcoming season. Jurgen Klopp, the manager of Liverpool, is looking forward to work with his new signings, one of them is Mac Allister from Brighton. He's definitely one of the club's best midfielders, and his presence would be felt all throughout the team.
Only Firmino and maybe Milner, had an impact in the overall team performances throughout the season. For others, not so much so I doubt they'd be missed as much as you're exaggerating their importance. I'm happy with the replacements we got even though I'm yet to see them play/perform - That's the kind of regard I have for them. It was obvious last season that oyr midfield was the weakest link so it was a delight to Mac and Szoboslai getting signed to strengthen the midfield. Fabinho was average last season but I felt it was mostly because of the other midfielders by his side that left him exposed most of the time. Exciting times are ahead. Preseason starts in a few days, let's see.