i'm interested in all classes. i'm new to dnd5e though. still learning the rules. is the total max of 4 attacks attainable by multi-classing only in dnd5e? kinda sad that extra attacks doesn't stacked. on topic to monk. is there similar scaled fist monk in dnd5e that uses CHA instead?
Not sure if you're familiar with 2E AD&D (i.e. the original baldur's gates) - but the attack progression in 5E is actually closer to that (slower, and highly dependent on class), as opposed to the 3.5E/Pathfinder systems (i.e. NWN 1, 2, Pathfinder Kingmaker/WoTR).
Similar to BG2, the BG3 base attack progressions (without abilities, feats, and dual wielding):
1. Fighters - up to 4x Attacks (@ level 20) / 3x Attacks (@ level 11) / 2x Attacks (@level 5)
2. Rangers/Paladins/Barbarians/Warlocks (Blade)/Monks - 2x Attacks (@ level 5)
3. Rogues/Clerics/Druids/Wizards/Sorcerer/Warlock (Non-Blade) - 1x Attack
So it's very similar to BG2 where Fighters with the Grand Mastery (Fixed) will have more attacks than anyone. If you're looking for a "sustained" 4x Attacks, a Fighter 20, or a Fighter at level 11 dual-wielding will gets you 4 attacks without feats or resource expenditure. Other classes can vary their # of attacks based on abilities (i.e. Monks can spend resources to flurry of blows for 2x off-hand attacks).
It's not like 3.5E/Pathfinder where every "full BAB" class progresses in attacks the same way (i.e. Paladins, Fighters, and Barbarians all get 4 attacks at level 16). The progression is tied to a specific class, so a 5 Ranger / 5 Barbarian / 5 Fighter will only 2 attacks - so the system really does not favor dipping for attack progressions. You also don't see off-hand attacks get higher than 1 in 5e (whereas you can have mutliple off hand attacks with the right feats in 3.5/Pathfinder).
This isn't' necessarily a nerf though - multiple attacks in 5E is much more flexible and impactful than 3.5/Pathfinder. Firstly, making multiple attacks no longer require a full round action - meaning you can actually move and attack multiple times in the same turn interchangeably without issues at all. Whereas in 3.5E, making a full round attack is almost a rarity. Secondly, there no extra attack iterations. I.e. in Pathfinder your attacks at 16 BAB is +16/+11/+6/+1. In 5E, you'll make all your attacks at the highest attack modifier.