It breaks things and you have little control over it. It replaces default search domain with its own. Also it does't keep your DNS servers in your resolv.conf

It breaks things and you have little control over it. It replaces default search domain with its own. Also it does't keep your DNS servers in your resolv.conf nor tries to forward your query to them when it fails to resolve it. So, you may experience a loss of connectivity for short hostnames w/o tailscale (host instead of host.my.domain) or get unnecessary overhead for TS-enabled hosts within your local network.