I agree that I wouldn't like to use crypto for taxes, because it appreciates so much over time. Imagine looking at decade old tax returns in the future and thinking "that 100000 sats I paid in tax could buy a mansion now!"
Also: the second you pay in BTC or ETH, the second they have positive confirmation of an address under your control. True, most stablecoins would have a similar downside, but that also depends on how you run our wallets.
Personally I'd rather stick to fiat for taxes - or better yet - not pay those extortion fees at all!
RE: AskLeo - Would You Pay Your Taxes With Crypto?