The 1.20 format in the grid pattern creates a very ugly, clearly noticeable joint right in the middle.
No matter the format, there belongs a center in the middle and no joint. I would never split 240 into 120/120, but classically 60/120/60 (or "at worst" so that from one row to the next center and joint alternate, but never with a "joint middle strip").
I don’t understand why everyone is so eager for larger tiles.
That probably has to do with the same "new prudery" as the overhead buttoned-up privacy fences and the locked bathroom doors. The "Sagrotan generation" has absorbed too many TV commercials for bathroom cleaners and now can’t get the association "joint = bacteria reservoir" out of their mental movie theaters. But the jointless maniacs can be helped: with jointless coverings like, for example, terrazzo – against fear of accusations of old-fashionedness also in neon metallic ;-)
90s house? That I associate with the picture. Old-fashioned. One of the first measures would be to tear out the tiles.
Why – are you under pressure to be trendy?
In my opinion, large tiles are only mainstream, which is reflected in "getting bigger and bigger".
Perhaps a voluntary speed limit of 250 km/h will establish itself in further areas someday :) . Besides, the visual prominence of the joint rhythm can be influenced not only by turning the frequency knob but also by the contrast between material color versus joint color. And: you don’t have to "pull through" a tile format over the entire surface. For example, I could imagine alternating a row 120 wide with a row 60 wide (in a pattern with staggered joints) (or even mixing rows 120, 60, 30, ... irregularly, throwing in some "black keys" with dark 120/30 tiles, etc.). The combination "large format + grid pattern + strong material-joint color contrast" requires, in my opinion, mandatorily coordinating the entire floor plan to the joint grid as a planning grid. Then you have to have the walls placed by watchmakers instead of bricklayers, including a surveyor present continuously throughout the entire construction. Otherwise, you just don’t treat yourself. With every jot of deviation, this combination becomes aesthetic torture. Additional question (presumably) "off-topic": are there actually Yps fans here who tile light blue in a grid pattern and then grout yellow?