raise navies -> clicking a ship -> holding shift and making a frame across the other ships -> gathering them in a sea province -> embarking your army -> moving the navy -> disembarking your army -> dissolving your ships instantly / sending your ships back and then dissolving them
This is just a hassle and not added depth.
A complex navy system like in EUIV doesn't make sense and the CK2 system was just obnoxious.
I'm happy with the return to the CK1 system.
Right but I'm not sure people are complaining about losing the "depth" of what you described.
Here's what I miss
1) The long term strategic decision of whether I want to spend resources to develop a navy capable of carrying my army. If you start in the Charlemagne or Old Gods start date, you won't just naturally have a navy big enough to carry your army. (Though apparently in the 1066 start, most countries do start with big navies?).
2) The tactical in war decision of whether to keep my navy raised throughout the war and next to the county where I landed so I can quickly evacuate by sea should I need to. (Some people say there's no decision here because it's just vassal navies you keep raised, but again, unless our play experience is very different because you start in 1066 and I start earlier, there's simply no way vassal navies are anywhere nearly numerous enough to transport my army by itself)
Then there's a whole bunch of tactical in war decisions related not not having a big enough navy:
3) The decision of whether to hire a mercenary navy to transport my whole army at once because I don't have enough ships to transport my troops piecemeal.
4) The decision of deciding where to land my troops because I only have enough ships to transport my army piecemeal, and I don't want my split stacks to be crushed by the enemy army while I'm only midway crossed.
5) The decision of whether to march by land or go by sea if my target is very far, so that I don't have to worry about the split stack problem above
6) The decision of whether to retreat my navy back to home to pick up reinforcements, and thereby leave my troops stranded without a naval escape option temporarily
All of that is distinct from the "micro" you're pointing out that is bad with navies. But for what it's worth, I don't even think all micro is bad. To the extent that you have a nation with a bunch of far-flung ports, I don't really think the "having to gather navies from all over" is bad - it presents you with an interesting tactical decision of whether you want to wait for all your ships to gather and thus delay your troops, or you want to favor time and make an attack with not your full troop count because you don't have your full navy.
Like for example, suppose you hold a kingdom in Brittany as well as a kingdom in the south of Italy. I like how in CK2, if I wanted to fight an enemy, my armies would be understandably split - I'd have an italy army and a brittany army, and there'd be interesting tactical and strategic considerations for both me and my opponent regarding whether to merge the armies, whether to take fights with the split armies, trying to attack quickly while my armies are split, and so on. Now compare this with the CK3 system, where I just set a rally point in whatever province I want, click one button, and boom all my armies from everywhere spawn there. If I get outmaneuvered and attacked at a different kingdom than the one where my troops are, in CK3 I can disband my troops and then reraise my entire army where the enemy is - I magically teleport my army, no problem. Is this a hell of a lot less micro than in CK2 where you had armies everywhere and would have to actually be bothered with the hassle of moving your troops? Absolutely. But did we pay a steep cost with regards to the strategy of the game - I would say yes, and it certainly wasn't worth it. So too with navies.