Don't forget "but there will be more bicycles" is a much stupider and easier to call out excuse for trying to prevent affordable housing than "it will make traffic worse"
Also vehicles that are easier to stop are far better for small business owners and local economies.
Also keep in mind traffic speed is usually somewhere south of 20mph. You can get places quicker at 18mph non stop than you can at 30 or 50 with congestion caused by traffic control that has lower throughput on a 4 lane each way intersection than a single bike lane with no control.
30mph vehicles are LEVs not bicycles and should be treated as motorscooters or whichever similar law framework is available and not allowed on bike paths or shared paths. That said, I fully support LEV only zones possibly where bicycles are allowed in a similar vein to how they are allowed on roads and possibly before bike only zones in less urban areas)