I'm firmly in the camp that Frank is doing what he is doing out of necessity at the moment, so I resonate with most of your post above.
If you take the view that footballers come in broadly 4 categories, those being Elite, International, Domestic, and Prospect, the reasons for Frank's pragmatism is that the squad has:
1 Elite Player - Romero
19 International - Vicario, Dragusin, Danso, Palhinha, Simons, Bissouma, Richie, Maddison, Udogie, Solanke, Kudus, Kulusevski, Gallagher, Porro, Spence, Sarr, Bentancur, Micky, Muani.
2 Domestic - Davies and Austin
6 Prospects - Kinsky, Gray, Bergvall, Tel, Odobert, Sousa.
When you then look at the injuries it drops to 1 Elite, 8 International, 1 Domestic and 5 prospects.
So basically Frank has to pick a team from 15 players five of which are kids within the first team squad, and this is going to be the case for the next month at least in all cases bar Spence.
That requires pragmatism. Now is not a time as a fan to be crowing for our beautiful Spurs back. Now is a time to get 13 more points on the board, secure our league position and then have a long hard look at the non playing staff at senior level to understand what they are doing. Our academy, our recruitment, and our player sales are underperforming, and all need review. Lange doesn't feel like the answer to me, though I know nothing of his actual performance day to day, obviously. Vinai is too new to have any real responsibility for the situation bar the outrageous statement of intent that was his open letter to fans, which on reflection now just looks stupid, really.
Finally to the manager - I really do think he can take us to better places - he's really clever, really structured and knows what he wants. Those saying he is out of his depth are doing him a disservice - we are the very definition of a poison chalice right now, and its to his credit that he's not letting things get to him in the media. He's doing what he believes is necessary to get us out of a dog fight, and I for one back him to achieve that. Could be famous last words, but I doubt it. I absolutely don't think there's a caretaker or an out of work manager who mid season could do better.