If the seed phrase is the only thing that really matters, why do we still care which wallet software we use?

Hi everyone, I fully understand that with a non-custodial wallet the private keys are derived from the 12/24-word seed (BIP-39) and that, in theory, any wallet that follows BIP-39 + BIP-44/BIP-84 should be able to recover the exact same addresses and balances. So my question is: once I have my seed safely backed up, why does the choice of wallet app (Electrum, Sparrow, BlueWallet, Trust Wallet, MetaMask, etc.) still matter so much? Can’t I just use the cheapest/simplest/most lightweight software possible as my daily driver and, if one day that app disappears or I don’t trust it anymore, simply import the same seed into any other compatible wallet and keep going without losing anything? What are the real practical risks or limitations of treating the seed as “100% portable” and switching wallet software freely? (derivation paths issues, support for certain coins/scripts, privacy leaks, signing bugs, etc.) Thanks in advance!