hmmmmm.... a very sensible non Festool purchase response.....
I have nice TS set up, as well as the TS75 and all accessories....
So what do you value more?
TS55/75 benefits.
Portable, you can bring to worksite with ease, if that is an issue.
Incredibly clean cuts on sheet goods, with no worry of slight jagged that happens when sheet goods are not dead up against fence on TS.
Add MFT, you now have a very sensible and useful Radial Arm Saw replacement, great for cross cuts...
if you break down large sheets into long rips, like sides of book cases, having the long rail, makes this job easy with perfect cuts... not true till you step up to about $5k sliding TS.
If time is money, with the Festool system, your first cut is your final cut, vs. the rough cut then trim at TS, lots of extra work, more chances of errors.
Table saw benefits...
The Rigid line of TS have very small tables and very short fences... not ideal for sheet goods...
however, if you break down the sheets with rough cut circ. saw as mentioned above, AND the pieces are small, a small TS might suffice. But if the final pieces are large, as you are describing, small TS is tough to handle....of course, you can jury rig making a larger tabletop, fence system, etc. but at that point, it pays to step up to a cabinet saw...
TS great for cutting small pieces...
as a general comment... Rigid and other BORGs sell TS geared to construction trade, not fine woodworkers... low price table saws have low priced motor / shafts and bearings... (as well as other low tolerance components) all this equates to mediocre cuts, at best, and over time, the bearings get shot, making the cuts even worse.... so even if you try to rough cut and then final cut on TS, I would not suggest you get that type of TS... move to a small cabinet saw, go used if you have to..