bug unlimited, how many more bugs?
A limited number.
On the flipside, core has had a fatal bug, known for years, that they refuse to address. This is, of course, the inability to process more than ~250,000 transactions per day.
BU is one method of increasing transaction capacity, Core's method (SegWit) is another. For the years that Bitcoin had been running before this hype, I bet you weren't complaining that the transaction capacity was too small. The block size shouldn't just be increased every single time the transaction capacity does, there should be changes to make the protocol more efficient or partially offchain as well (extension blocks, LN etc), which are better for decentralisation.
Your argument is basically that people shouldn't support Core because their ideas haven't been supported yet.