It is quite a diverse condition. One of the reasons is some asthma patients take some very heavy steroids (many types of tablets, infusions, injections (not used so much now) and types of inhalers), along with frequency and dose that pushes down and weakens the immune system. Others take different medications and lower doses of steroids. My father was believed to have chronic asthma until about a year and a half ago where another diagnosis of a similar condition was given. For six years under that diagnosis he had quite a lot of steroids in most forms (unfortunately with some very bad consequences). It's been noticeable the last couple of winters he's been in hospital less (but still a hell of a lot) and it's not been for pneuomonia, chest infections so much/at all. Which he had 2/3/4 times each autumn/winter. Or just a reoccurring mush. He's still a massively at risk group for flu as he ticks lots of boxes, but the steroid one really does make a bit of difference and for recovering/lingering etc.
If you are concerned I would recommend ringing an out of hours pharmacy, being incredibly polite and flattering go through your medication and asking flu risk. You could even frame it in terms of managing asthma. They may ask you to ring back when it's quiet e.g. 10pm. You may get unlucky and have a pharmacist a bit less interested/talky on flu. Or one who's a bit cranky or bad tempered (they are overworked). Because there isn't so much time often in GP surgeries many pharmacists and staff have heard/met a hell of a lot of people with asthma. The problem with talking to people about asthma is if there are other sides to it as there is yours, people often immediately say 'severe' to someone else (heard this three times this week) and conversation shuts down (it was meant to, that's why the person said it).
