While I get your point, I want to disagree with the severity here.
Getting Persuasion in 5e is really not hard. Its not a big cost. Oh I'm a noble instead of a solider....done. Just that simple. Backgrounds are mainly about skills, so if you want a skill, take a background that has it. Done. Skills are pretty easy if you want a specific one, its just hard if you want a LOT of skills.
Choosing one manuever to be really good at something is not a huge investment. Maneuvers can be spammed, there is nothing that stops a BM fighter from just using say.... Parry and Precision attack all day every day and be perfectly, wonderful fine in combat. If you want to take the last maneuver for a persuasion bump....your really not reducing your combat effectiveness all that much.
Maneuvers aren't exactly spammable. The point at which a wizard can cast as many spells as the BM gets SD is
only 5th level.
And that assumes a two short rest 'ideal' adventuring day, which many groups do not achieve.
Having the skill training is a first step. However assigning points to a tertiary or worse stat in order to get a good total bonus is a big cost, compared to a caster, who gets a big chunk of their utility (spells) from their primary ability score.
Furthermore, and this is also important,
at base a caster can generally get a higher bonus in more skills than a non-caster. There are simply
more skills that key off casting stats than physical stats. A caster can pick 4 or 5 skills that use their primary stat. Even a Dex-based fighter only gets three. (and or course Sre-based only get 1.) Outside of actual class features specifically boosting skills (like the Rogue), martials not only only get
just skills at base compared to casters getting
skills + spells, they are actually worse at skills.
So basically u want the abilities of magic without the limitations of magic like not being dispelled or countered and functioning in antimagic areas and other limitations that magic has. That sounds fair.
Has
anyone actually suggested that martial abilities that do the same things as spells not have limitations? Seriously?
I think it likely that martial maneuvers will have their own limitations For example one of my Warlord hacks was mostly a Valor Bard with a limited "spell" list. These didn't count as magic, but they did require line of sight, the "caster" to be visible and audible to the target, including throughout the duration if a concentration spell. These actually ended up as more restrictive than magic spells would have been.