I don't necessarily disagree, but let's think about it assuming 2 games per week.
The back line will probably not be rotated much, so 5 players for 3 positions should be more than fine.
WBs will be heavily rotated, but having 4 for 2 spots would be fine. That means 1 game per week for each player (or 70 mins one game and 20 mins the other).
Midfield will also need heavy rotation and we have 4 players for 2 positions. Same rotation as WBs.
Front 3 also will need heavy rotation and 5 for 3 positions is also fine. You sub two at the 70 min mark each game and the one who played the full 90 starts on the bench the next game.
And a backup goalie.
So if you add all these up that's 18 outfield players and the backup goalie. Add an average of 3 injuries and you either add a few more mins to each of the remaining players, or you bring in someone like a Tanganga, or Sarr, or Scarlett/Parrott for cameos to give the main players a breather. Or a combination of both. Will depend on the game. And it also depends on when your injuries happen, i.e. during a stretch of games where it's a game every 5-6 days or a game every 3-4 days.
Obviously the bigger the squad you have the better, but theoretically you could also get away with a 20-man squad. And let's not forget that a big squad also means players who get to play very little, which will impact their motivation and value, if we want to sell at some point.
I just disagree with you. And fortunately all the signs are by being linked with HG players Spurs want to increase squad size to 23 or 24 players if possible.
Players need to be both physically and mentally fit to play games - and as all the medics agree, recovery time between games is a minimum of 4 days, which you don't get playing regularly at weekends and midweek which is fatiguing both physically and mentally - which is why injuries often occur.
Hence wanting to have 2 players per position and a 3rd GK or 23 players in the squad. Even then we may be unlucky to get 2 or more injuries of players in one position, which is where players such as Tanganga get moved to cover any defensive shortfalls - even when player and manager knows its far from ideal for player or team
Even with 23/24 players all the squad will get playing time - how much the players with least games gets probably depends mostly on injuries