My view is this.
If you're going to change your philosophy due to injury, then you already don't believe in your philosophy. Punters call him naive, but what is really going on, is he is imebedding it irrespective of the situation.
If you are the manager and you have seen the evidence, in other leagues, and against other teams (man u, city AND liverpool as wins) that the system works. You're not going to change.
You're also not going to revert to 'safe' just because there are injuries... Why? Well, whether you finish 6-16th it doesn't matter. Scrapping for a draw here or there.. is essentially meaningless. That is why he is not changing... it's short term pain for long term pain, and the average (and yes... i mean average) punter who is starved of 'expected' success - find it difficult to look at the long term, they want immediate evidence and success irrespective of context.
Ange already alluded to it in the press conference... it takes 2 years minimum to turn things around. We're 18 months in.