I think it's less a matter of needing to change tactics than it is certain set ups being less sensitive to losing key players. Ideally, unless you're actually Man City and can do what you like, you have a system and squad that can dig out a 1-0 win reasonably reliably even if you're having a bad day. That might sand off some of the real top end performances that you potentially could get with another more flair approach.Which is fair enough.
However, the frustrating thing for me was never having a settled squad. The injuries meant it was constantly changing. We did try changing tactics to accommodate that if everyone remembers We went three at the back, it was far worse than 4-2-3-1. It was also the only option at times, but he stuck with it for far too long. Ditto with changing keepers.
I’m certainly not claiming RDZ had a great 2024. He obviously didn’t. But anyone who thinks you can switch from one set of tactics or patterns to another when you don’t even know who’ll be fit to start really doesn’t understand football.
The Liverpool team that won the league probably wasn't as exciting as some of the teams they had in the seasons before, for example. And some teams that had a whole bunch of injuries this season clearly handled that better than we did. I'd be surprised if many of them managed it by schizophrenically switching between hoofball and tippy-tappy poncing around the back from game to game.
On flexibility and plan a/b/c in general, you often (across all sports) hear about teams who go into great detail on planning for specific opposition, and also hear about teams who don't bother too much and just concentrate on their own game. Both sound great if you've just won.
This post is far too long given it combines being trite, non-committal and stating the obvious in equal measure.