İn the baroque the ordinary touch is non legato.So what do you mean with baroque legato.And in the classical period ordinary touch was non legato(when notes unmarked).İn romantic period non legato was still fashinable.My prof always say Brahms,schubert,chopin,schumann must be played always as its wrote.But some of english composers like clementi bring forward legato style.And beethoven and czerny about 1804 began to use legato style.But in russia,germany,norway,france and england to using one to one notation.They are so solid in notation.The most of the big composers from this countrys like milton babbit,schostokovich,prokofief,schönberg,anton webern,schnittke,ravel,debussy,Françaix,stravinksy,shchedrin,Gubaidulina,janacek,bartok exct...
Romantic style just a style for some of romantic music.But we cannot read all the scores with this rules.
Lets think about it
Unmarked notes is non legato in Baroque,Classical,romantic,impressionist and modern eras(expressionism ext..)Because tied and untied notes always different all of the periods.And the pianist must know this basic rule.But pianist can play legato style in Baroque,Classical,and romantic age like all pianist do.But in the the twentieth century the composer must write slur if he wants slur.Because of this non legato notes always play as its wrote.Tempo and character of piece doesnt concern the pianist...