Risky or stupid.I don't know exactly what you mean by not seeing "any risks being taken", and you seem to be suggesting a correlation between taking risk and seeing results? Sorry if I interpreted your statement wrongly.
Personally I think it's risky to force a switch to 3-4-3 in the middle of the season without having the players to play in the system. It's like performing a heart surgery while running a marathon. Ruud playing 4-2-3-1 is not risky, because he is reverting to something that our players know best and makes full use of the natural abilities of our players and leverages our greatest threat, which is our wing-play. Even ETH's system of leaving gaping holes in the middle is precisely because he wants to fully utilise our wide players. Garnacho and Amad on either side of the wings present a potent threat and the game is much easier for Nacho direct style of play if he only focuses on the byline. In contrast, he has been fully exposed when trying to play in a more central role.
In terms of "failing to score" - again I don't know if you have been watching matches, but you can see exactly where Amorim's system is breaking down. Most of our best attacking play goes through Bruno. Otherwise we lack a player to break the lines or progress the ball meaningfully to attacking areas, and Nacho has been very poor in his decision making or even dribbling. On the attacking side, much as been said about Højlund and I don't need to add to that.
Is it a surprise that we look much better whenever Amad is playing? Because we have an additional outlet for attack transitions whenever he's playing, in addition to Bruno.
He has himself admitted multiple times that's he is not going to change and that's how he wants to play. I admire that and no issues with that; however, then you have walk the talk and be able to show at least a few glimpses of implementing the said system. Otherwise, you need to bite the bullet and adapt to what is available.