True, but again the Incendiary grenade is simply OKW's only option against cover early on. Cons, again, have access to Oorah, giving them significantly better mobility than Volks. The fact the Molotov is 33% cheaper than the Incendiary grenade should imply that it ought to have some downsides, as well.
The molitov is slower to throw and has less range. This combo means that cons will take more damage using it. The later is also a massive boon because it's much easier to get a lava made off when charging an Mg frontally. This is especially problematic for both Maxims and vickers who struggle to suppress. Another boon to the extra range is the ability to deny cover from cover, something that usually won't happen with the molitov.
Another HUGE thing is that the molitov costs 80mp and 10 fuel which more than offsets the 10mu extra the lava made costs.
For no extra tech cost and increased range and faster throw perhaps the lava nade should have more of a downside than 10mu.
Matter of fact not being able to frontally burn down mgs would be a more than welcome change...