@Nabil365 : Just because you see only 6 missiles on either the corvette or the frigate, that doesn't mean more aren't carried as reloads (Igla 1 type MANPAD are after all man portable so with missile weight 17.9 kg manual reload should prove extremely feasible)
Let me remind yhou that on the 3,144 ton full load F22P (2x4 C802) and 2,500 ton full load Bangabundhu (2x4 Otomat Mk2) you see only 8 HQ7/FM90M missiles. Perhaps there are 8 more carried for manual reloading. But these missiles are far larger and heavier (84.5 kg) so manual reloading at sea will be much more of a challenge. In the most ideal of circumstances, FM-90N has a range of 15km (against seaskimmers likely less than that)
As for the 2,270 ton full load Lekius, they have a VLS farm with 16 × VL Sea Wolf (140kg), which have a range of 10km. Not spectacularly different from F22P and Bangabundhu.
F22P has a 76mm and 2x 30mm gatlings from China, Bangabundhu a 76mm Oto and 2 twin 40mm Oto cannon. Lekiu has a 57mm Bofors gun and 2 × MSI DS30M 30mm cannon. They all are fitted with 2x3 tubes for lightweight ASW torpedos and have a organic helitopter (i.e. helipad plus hangar). All have a 4 diesel CODAD type propulsionand twin screws. Nothing out of the ordinary.
Now, if you had compared with the 2,985 ton full load Thai F25T Naresuan, with its 8-cell Mk41 for 32 x RIM-162 ESSM with 50km range, you could have had a point. Except for this and its 5 in/54 (127 mm) Mk-45 Mod 2 main gun, however, armament is comparable to the 3 ships above. Its Chinese
Type 76Atwin 37mm have by now been replaced by 2 × 30mm MSI-DSL DS30MR.
Originally
After refit
So, really, what you are implying makes very, very little sense.
Should Myanmar manage to put e.g. 16 (or even just 8!) of the 15km Indian Maitri/SR-SAM or e.g. the 20km South African Umkhonto-IR or e.g. 1or 2 Sylver A35 8-cell VLS + 20km VL Mica on its 3,000 ton frigate, they have a very strong competitor (including because it has an impressive gun armament and matches the other contenders in other weapons areas). Likewise for their smaller corvette.
Anyway, just because at this point a smaller missile is used, and fewer of them are in direct view, doesn't automatically disqualify these ships. Recall that the 2,350 ton South Korean Ulsan class, from which Bangabunhu derives, has no surface to air missiles at all. Of the 9 originally built, 7 still remain in service. Are you suggesting these 1980s ships are inferior compared to say, BN's ex-USCG Hamilton's or its ex-Chinese 053H1/H2 ships, Type 056s or even Bangabunhu itself? Just because there is no SAM?