Okay I guess....



I doubt that those things will be useful though unless you change blockades completely.



Even when you for some reason max it you wont have enough marines to form a complete army. So you have to micro your marine stack to arrive 1-2 days before the real army to start the battle without crossing penalty and then get reinforced.

And imo this level of micro doesn't really add to the fun nor are there many situations in EU4 where this is required.



Because of the ZoC mechanic naval landings are hardly used anyway as you are always just one lost battle away from a stackwipe. So either you land with an overwhelming force or so far away frim the enemy that speed doesn't matter. And you only need 2k marines anyway to capture a province without fort to instantly disembark the rest of the army.



So imo marines are at best a gimmick and units of last resort to make use if your sailors if you get them as british once manpower becomes relevant again. At worst they are just more micro.



How do they interact with the portugese flagship abilities anyway?



As for costal defenses, the only real use is to prevent the enemy from trapping your fleet in port with the attrition despite that being a historic tactic.

And the rest? Who blockades provinces anyway? You get warscore elsewhere and the little bit of devastation is neglible. And by the time naval batteries come in play you simply use naval barrage on forts to negate their siege defense. No need to leave a fleet there.



Still a gifted horse etc. and its not as if RB and GC wouldn't need a bit more meat, even if its a bit late.