At least all-round protection against .50 cals. The BMP-2 only has it on the 60° frontal arc. And a beach is going to be full of machine gun nests.
Some may speculate so but lets say that if operated properly, there exists maybe a 5% chance a HMG could penetrate and kill a BMP-2. Its a statistical thing.
That's more like the requirements for an APC. IFVs are meant to be more armoured and better armed so they can fight in urban areas and under relatively heavy fire.
For anything more than shrapnel and small arms to HMG you need something like ERA or NERA and there is no end to it: If you can protect against PG-7 you may remain venerable against tandem RPG rounds. Then what about recoilless guns? If you can protect against those you may not be able to protect against machine canon firing APFSDS if you achieve that a tandem TOW/Konkurs will still kill you...
The job of a IFV is to mechanize your infantry squads, give them machine canon level firepower plus plenty ATGMs and long range targeting.
Mechanize more of your infantry squads instead of trying to build a low firepower tank that will never reach tank protection level. If you are Israel, then yes, spend that extra money for a Merkava IV based Namer IFV or dream about numbers of a T-15 IFV.
In all other cases you better equip your infantry squads with BMP-2's, a light, fast, amphibious IFV with very high firepower. As you know you can get several of those for western IFVs.
There are many analogues to this case: Iran will probably soon show a Spike based fire and forget ATGM but if it is not cheap enough, the better approach is to equip more units with Dehlaviye ATGMs instead.
A IFV in urban warfare is a sitting duck, you can develop a ERA packe for it in such conditions if RPGs are the maximum the enemies have. But better send MRAPs there and equip the BMP-2 with a TI equipped optics to provide 30mm high ROF firepower from RPG-safe distances.