I personally don't mind having silent teleport spells, invisibility without fringe effect (except in dusty or rainy environments), and other things. I don't mind that the players feel their characters are powerful because they can cast extended spells and stack them before they strike. It's part of the fun.
A group of flying, invisible, silenced (cast on a small item they carry, of course), mindlinked PCs that just teleport into the target's stronghold. Of course you can. Of course it is efficient. Of course it becomes part of your standard procedure.
Don't mind if some people already know how it works because they also know a couple of things about magic.
Don't mind if I use it as well.
Sometimes, I think it's good to adopt the John Wick style of game mastering.
Say yes. Make it part of the world.
Then let them realise they got exactly what they wished for.