It has failed because it's impossible to balance.
You either get the previous patch Sections which are OP in cover and trash out of cover and the faction is UP, or the current patch sections which are OP in cover and good out of cover and the faction is OP.
Just turn them into normal infantry and properly balance them, everyone will be happy to see that.
Tommies cover bonus can be salvaged and it is not the cause of problem, it work for ostruppen for instance.
The rout of problem lies more to all the nobrainer upgrade tommies have available to them like bolster/medic/pyro weapon upgrades.
UKF would become allot more easier to balance if this buffes become side-grades instead of upgrade.
For instance:
Bolster becomes a individual upgrade taking up a weapons while tommies have cost reduce to 260
Pyro becomes an upgrade giving scope Enfields and taking up all slot while removing cover mechanism
Medic upgrade replace one entity with medic armed with a pistol
and so on