"Just give me bridges!" should use the default transport of the Advanced Options
- The "Just give me bridges!" button gives me vanilla bridges.
- The "Get Bridges" button in the Advanced Options gives me obfs4 bridges by default.
I think that both should give the same type of bridges by default, currently obfs4.
I'm also unsure whether offering vanilla bridges is useful in the Advanced Options. According to metrics.torproject.org vanilla bridges are only marginally used. So maybe you should consider not serving them anymore on bridges.torproject.org.
Tell me if you prefer tracking this in a separate issue.