Dought & Clear - - Friday Prayers - - Why aren't travellers mentioned in the hadeeth, “Jumu’ah prayer is an obligatory duty for every Muslim except four”?

In a hadeeth of the Messenger (blessings and peace of Allah be upon
him) it says: "Jumu'ah prayer is an obligatory duty for everyMuslim
except four." Why is it that travellers not included among those for
whom Jumu'ahprayer is waived in this hadeeth?.
Praise be to Allaah.
The hadeeth referred to in the question was narrated from Taariq
ibnShihaab (may Allah be pleased with him), that the Prophet
(blessings and peace of Allah be upon him) said: "Jumu'ah prayer is an
obligatory duty for everyMuslim, to be offered in congregation, except
four: a slave who is owned, or woman, or a child, or one who is sick."
Narrated by Abu Dawood (1067). Al-Nawawi said in al-Majmoo' (4/483):
Its isnaad is saheeh according to the conditions of the two shaykhs
(al-Bukhaari and Muslim). Ibn Rajab said in Fath al-Baari (5/327): Its
isnaad is saheeh. Ibn Katheer said in Irshaad al-Faqeeh (1/190): Its
isnaad is jayyid. It was classed as saheeh by al-Albaani in Saheeh
al-Jaami' (3111).
It was narrated from Ibn 'Umar (may Allah be pleased with him) that
the Prophet (blessings and peace of Allah be upon him) said: "The
traveller is not obliged to pray Jumu'ah." Al-Haafiz said in
Bulooghal-Maraam: Its isnaad is da'eef.
The exception of the traveller is also mentioned in a number of
hadeeths, including the hadeeth of Abu Hurayrah, according to which
the Prophet (blessings and peace of Allah be upon him), who said:
"There are five for whom Jumu'ah is not obligatory: the woman, the
traveller, the slave, the child and the people of the wilderness." It
says in Majma' al-Zawaa'id: It was narrated by al-Tabaraaniin al-Awsat
and its isnaad includes Ibraaheem ibn Hammaad, who was classed as
da'eef (weak) by al-Daaraqutni. Shaykhal-Albaani (may Allah have mercy
on him) said:(He is) da'eef jiddan (very weak).
It is no secret that the shar'i rulings should be derived from all of
the hadeeths that were narrated concerning thisspecific subject, and
theyshould not be derived from only one hadeeth whilst ignoring the
rest of the hadeeths.
The Prophet (blessings and peace of Allah be upon him) mentioned a
number, as we see in thehadeeth being asked about here, and mentioning
a number does not necessarily mean that it is limited to this number.
The aim may have been to make it easier to remember this hadeeth for
those who heard it. A similar example is the words of the Prophet
(blessings and peace of Allah be upon him): "There are seven whom
Allah will shade with His shade on the Day when there will be no shade
but His…" By compiling all the hadeeths which speak ofthis great
matter ("Allah will shade them with His shade") it becomes clear that
there are more than20 such categories, not only seven.
Al-San'aani said in Subul al-Salaam:
We can see from the hadeeths that Jumu'ah isnot obligatory for six
people: children, as there is consensus that Jumu'ah is not obligatory
for them; slaves, as there is consensus on this matterexcept for
Dawood; women, and there is consensus that it is not obligatory for
them; sick people; travellers, who are not obliged to attend it; and
the sixth category, which is the people of the wilderness. End quote.
And Allah knows best.