I agree, controlling immigration is a matter of ensuring economic stability. regardless of where immigrants are from. Of course some immigration is positive, but it needs to be contolled and be primarily considered on what is best for the economy (short-term and long-term)
Not just the economy, society as well. EU freedom of movement has been great for big companies here having access to abundant cheap labour and forcing wages down for people at the bottom and making it more difficult to find work. I’d rather take an economic hit if it meant more ordinary British workers could earn more money. Wages in the UK construction industry have risen nearly 10% since Brexit since fewer Eastern Europeans are coming in willing to work for less.