We have quite clearly strengthened our real depth basically in all areas except CB whether by improvement of our own players or new signings so ignore all the other squad depth accusations...factoring in players like Stewart or Sakho doesn't count because they were basically not used so can't be compared to this season's depth. Also we have many versatile players that helps us. CB was very important though...
GK: Added Ward = more bodies in depth
LB: Added Roberston plus Moreno has outcompeted Milner so we have a fair bit more depth there regardless of how people think Moreno is shite - we could still use the same player we had their last season if Klopp wanted to. Basically added 2 LBs since Moreno barely played at all.
CB: Lost 4th choice Lucas, replaced with Gomez
RB: Gained TAA (more experience/development) and Gomez - unfortunately Clyne injured but made no sense to buy another RB to be honest. Also Flanno is a body.
CDM: Lost 3rd choice Lucas but position can be filled in by Gini/Milner
CM: Added Ox, Milner (as result of LB situation), Coutinho (at times because of buying Salah)
Wings: Added Salah (and Ox)
Striker: Added Solanke, lost Origi.
Fully fit starting lineup last season:
Mignolet, Clyne, Matip, Lovren, Milner, Hendo, Gini, Lallana, Mane, Firmino, Coutinho
Bench: Karius, Klavan, Lucas, Moreno, Can, Sturridge, Origi
Decent squad players: 0
Young players (in 1st team): TAA, Grujic, Woodburn, Stewart, Ejaria (all barely played any minutes)
This season starting lineup:
Mignolet, Clyne, Matip, Lovren, Moreno, Hendo, Coutinho, Lallana, Mane, Firmino, Salah
Bench: Karius, Gomez, Klavan, Milner, Can, Ox, Sturridge
Decent squad players: Gini, Robertson, TAA, Ings, Ward
Youth players: Woodburn, Grujic, Ejaria, Flanno (expect improvement)
Basically we upgraded 2 players in starting 11, and another half if you include Moreno > Milner lol. Upgraded that bench maybe by 1 or 2 depending on how you view things and added up to 5 squad options that can be rotated into the team without too much drop in quality which we never had last season - with Gini and Robertson just about good enough to push for starting positions, TAA as a 2nd choice and the others 3rd choice.
Compare to Chelsea this season:
Starting: Courtois, Azpi, Luiz, Cahill, Moses, Alonso, Kante, Fabregas, Hazard, Morata, Pedro
Bench: Cabellero, Rudiger, Bakayoko, Zappacosta, Drinkwater, Willian, Batshuayi
Squad: Christensen, Musonda, Kenedy
Spurs:
Starting: Lloris, Trippier, Vert, Alder, Rose, Dier, Dembele, Alli, Eriksen, Son, Kane
Bench: Vorm, Aurier, Sanchez, Davies, Wanyama, Sissoko, Llorente
Squad: Winks, Lamela, N'Koudou, Walker-Peters
Can't really compare with the millions of Man City and Man Utd but there are still weaknesses in squad depth for them:
Man City no backup left footed LB for Mendy, no real no.6 like Fernandinho - next best option is to use Yaya and De Bruyne or Danilo there...not ideal. Also Kompany is a crock and 3rd/4th CBs are Stones/Mangala.
Man Utd: Probably missing a good winger. Left back doesn't look the strongest with Blind and Shaw though they are decent. CM options outside Pogba, Matic, Mata are Herrera, Carrick, Fellaini vs ours Can, Gini, Milner, Ox.