"more and more of a problem" is maybe a bit dramatic. It's a design constraint of composite structures exposed to lightning that you need to provide electrical pathways, which is what the designers do, and composite aircraft regularly get struck by lightning with no damage caused.
I don't think it's particularly dramatic. The Boeing 787 is the first airliner to really use composites to a high degree in its structure. There was and is plenty of controversy around it's lightening protection design. For example https://www.seattletimes.com/business/boeing-aerospace/faa-e...
It's also been controversial in small aircraft like the Cirrus SR22, for example complete failure of the radios and / or electric systems due to static buildup on the airframe.
It is literally a solved problem at this point. You solve it by providing electrical pathways within the structure, which is what is done in the 787 and other composite-hulled aircraft, and these aircraft regularly get struck by lightning with no issues.
I am not deeply familiar with the SR22, but if they are having those issues I guess they didn't implement the well-known solutions, or didn't implement them properly.
Engineering is all about managing solvable problems. When designed and built correctly a composite aircraft can handle lightning strikes without issue. However, efficiency requires engineers to be very carefully provide sufficient protection without excessive weight etc.
In other words, it really is becoming a more significant problem.
