If the tube has good venting like the SΩI Shorty, Broadside, Raven, etc. it's fine. You just need to do your homework and be very picky when selecting Tubes. With Tubes I build around 0.18Ω - 0.22Ω using Sony VTC5A's which are 25A, with parallels I build around 0.13Ω - 0.17Ω again with Sony VTC5A's.
I know there are some that build below 0.1Ω like between 0.05Ω - 0.08Ω and below on single tubes, me I believe that is not only unnecessary but dumb. Let me put it into perspective, 0.00Ω is a dead short, with voltage drop along with battery sag this is very dangerous and unnecessary. I can get a very nice warm and responsive vape on a single tube with a SS fused Clapton using around 29g or 30g core wire with around a 38g - 40g wrapping wire. What I really dislike also with builds around 0.1Ω the atty and mod gets hot very quick and retains the heat. With Mech's it's a balancing act. The mod, Battery and Atty is the combination that all comes into play, most of the fun with Mech's is searching for that perfect combination. Once found the Vape is a pure joy and very satisfying that no regulated mod can touch IMO.
Anyway welcome to the Rabbit Hole!
So now I sit and wait for that slow ship from China. Oh well, I figure for $30 I can't go wrong.
https://www.efun.top/ru/geekvape-mech-pro-box-mod.html?mw_aref=7514e9c19f8144d076a81176f7d085d4