Both Marvel and DC are missing great stories by visiting a previous era. Ex. Justice Society (based in the '60s or a WWII saga that teams Cap and Logan on a suicide mission.
I like what they did with First Steps, it deserved a much larger audience... that said, many fans of the MCU are only interested in the big tent pole films featuring the team-ups.
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For Marvel, I am guessing whatever reset happens at the end of SW can allow the new Logan and cap to have interacted. TBH, there aren’t any interesting legacy characters that the MCU has for a concept like this. The best I can think of is a character like Dr Strange who can be made to time travel to the past/future and team up with an older character. The MCU did have an opportunity with Hercules but we don’t know if that cameo will ever result in anything.