Here's how blobbing works with FRPs (especially early game OKW):
The blob comes and you successfully repel it, all squads are intact, but you've lost models across the board. Now, instead of having a fair time to lick your wounds... *poof* here's the blob again, complete with full squads. You're still down models, so you're out-manned at the get go. Say you repel it AGAIN, down more models and maybe retreated a squad all the way to HQ. Your squad(s) is still coming back, and you have half strength at the front and *poof* again, here's the blob with complete squads attacking en masse. Now you're done. Further, by the time the distances between their FRP and your HQ is equal, so retreat time is equal for both, well, they now own more of the map. All from A-move with a blob. No reason to flank or whatever, because with the FRP, they can recover faster and back in action sooner than you can.
Everyone loves to spin this magical scenario and they always use the posterchild of FRP, OKW. This argument might work in cases where the person fighting OKW doesn't have a clue about what other tools are available across tiers in literally any allied faction, but let me create my own scenario to show you how this could play out, specifically from USFs standpoint:
You don't counter the blob with your own blob. You let the blob move around the field together, while you split your units up and cap the rest of the map. Invest in suppression, whether it be a .50 cal or a quad, and force retreats as often as possible. Tech to captain (or don't and just get mortars), get pack howies, (also infantry doc has access to mortar ht which has access to white phosphorous, a tool that is especially useful for fighting against FRPs). Force retreats and prefire white- phosphorous /barrage combos at the retreat point and bleed your opponent. If they're smart, they'll switch their retreat point to their base and you likely have an unsupported truck to destroy.
Now you say, what about kubels? Can't they continue to cap the map while the blob moves around grouped across the map? Well, if the blob is truly scary, I doubt there was any MP to spare for a kubel after your opponent put out 3+ squads of volks, a FRP and
medics. But if there was, each faction has their counterparts which all more or less shit on the kubel. The ironic thing is, the unofficial balance team wants to swap the Sturm starting unit for the kubel. It will be interesting to see how that plays out in the scenario mentioned above.
The FRP is a risky investment, that's why you hardly see it used in top level 1v1 - it simply is not worth it in most cases. Go check the clip in trending of Von's FRP being shit on by DevM. That's one way of many that smart players handle those who want to take the risk of setting up their FRPs. And many of the arguments here has made it seem like an FRP basically hands you the game. I'd argue just the opposite, it's usually just a manpower/fuel trap for bad players.
When's the last time anyone ever saw a penal blob or lmg gren blob backed up by an m5/sdkfz respectively? Or the (now extinct) hated double 1919 blobs?
I did this just the other day, and it isn't uncommon. 1 MG into 4 grens and an HT and just pushed my opponent off the field in a 2v2 random against a premade of blobbers, 1 USF and 1 Soviet. I didn't necessarily blob, but all my units fit on the screen. All I did was move up to their base with the halftrack reinforcing losses, under covering mg fire until I was able to spam p4s. USF had his FRP which I punished more than once, and Sov player was blobbing his penals everywhere. My teammate was also Wehr. Just because you don't see it in whatever mode/level you're playing at doesn't mean it doesn't happen. And hearing you voice your opinion so strongly against an FRP and knowing that you think the above is rare/doesn’t happen at all gives me some insight into the type of mentalities that seem to be encouraging the removal of FRPs, which is concerning.