Don't shop at Asda so can't comment on that particular product but I don't eat meat and sometimes, like most people, I want something that I can just stick in the oven without any preparation, so yes, I will sometimes buy processed plant based products.
I certainly don't buy it as a 'healthy alternative' because more often than not it isn't that healthy; it's just convenient.
Do you never buy anything that doesn't require being made from scratch or isn't in the extremely healthy range of foods OP? If so, I imagine you're one of very few.