I just drive through the rain and dry the car out when you get home.
Been driving Cobras in all sorts of conditons for many years and if it starts raining you either just find some shelter and wait it out or you drive through it. Trying to rush to put a soft top on in the rain on the side of the road is not my idea of fun and often not worth it as you & the car interior are generally wet by the time it all gets fitted anyway.
Now putting the soft top on during the middle of the day to keep out the sweltering heat, now I can understand that and that would be a bonus.
All comes down to personal preference and I expect your climate. I could easily live without a top for day trips. For long distance, multiple day/week trips, then a top would be mandatory for myself.