I think "senior" has at least two types. There's the FAANG-alum seniors who are used to and will put up with full-day or even multi-day interviews full of leetcode shit or "gotcha" edge-case quizzes about language features you trained yourself to avoid a decade ago or take-home assignments ("4 hours" sure except the other candidate put in 12 hours and lied about it, so...) for that sweet, sweet crazy-high comp. Unless you're offering these sorts a CTO position, they're not applying to your non-FAANG-tier-comp-and-security-and-presige company. Period.

Then there's senior in most of the rest of the industry. We don't do long, annoying interviews. If your process drags on we've already accepted one of our other offers. We don't make FAANG money (mostly) but we also don't put up with horseshit. You want me, or not? If not, 100 other companies do, so bye and have a nice day.