5.5 is a series of marginal or obvious improvements alongside numerous arbitrary changes for change's sake with no clear guiding design principles. If you want to introduce elements of it that makes sense to me, but I think a group that already knows the rules for and owns the materials for 2014 5e won't get much from switching completely to 2024 5e other than a headache and added expenses.
But I am bitter because I crammed the 2024 PHB over the course of two or three nights after my group of newer players I was DMing for voted for those rules. It's like 90%+ the same, but that just means the differences (usually buried under the same spell, ability name, etc.) are hard to spot. I think I chucked the book at the wall when I was skimming through the Spells and found that Sleep was a completely different spell in almost every way but still had the exact same name. The commitment to preserving the same names to hide the changes extends to the names of Hunter Ranger abilities being the same even where the actual abilities no longer correspond to those names. For my brain this sort of crap makes it harder to get real system mastery of the 'not an editio"n edition than just learning a new system, but clearly other people's mileage varies.
The group I learned it for has basically ended up playing a loose mix of 2014 and 2024 rules, partly because when you google a rule, statblock, etc. for "5e" or "D&D" you still get hits for 2014 rules first, and actually I'm probably the only one who cares about the rules edition for anything outside of character options anyway, and I can't keep them straight.
But learning 2024 rules did do a great job of muddling my 2014 rules knowledge. So if you're worried you aren't confused enough I highly recommend it.