Well ohviously they were flawed because it brought us inscriptions.

segwit enabled a cheap spam vector. taproot also opened up a vulnerability. i don't think segwit was intentional but i was in the schnorrr signatures camp back in those days. IMO segwit needs to be deprecated and people encouraged to move their UTXOs to taproot. taproot still hasn't achieved full penetration yet, but the benefits of taproot are manifold, not the least of which being full channel open privacy and improved coinjoin transaction sizes since multisigs only take one combined signature for potentially hundreds of signers. taproot also was unnecessarily complicated on the API side. simply using taproot signatures (schnorr) is obfuscated by the API, because of the "tweak" thing. that tweaking is for smart contract sub-addresses. but you can perfectly well use taproot as a simple HD keychain as well, since tweaking and HD path derivation is much the same type of thing